I have always liked the Necromunden "lucky Sevens" this is one of the old school gaurd units.

http://wh40k.lexicanum.com/wiki/List_of_Imperial_Guard_Regiments

 Elysian Drop Troops.

I absolutely love their combat doctrine. Valkyries are completely cool, the Tauros is my favorite vehicle in 40k, their Setinels look rad, I'm not a fan of heavy tanks… And their aesthetic is nice, too. Old-school sci-fi with those funny lascarbines. I'd love to see Forge World do a sculpt of some Elysian Stormtroopers.

Either Death Korps of Krieg or Elysian Drop Troops.

 Valhallans all the way.  I like their tenacity and the fluff for them from the old 2nd ed IG Codex.

Catachans.

I just think they have a lot of personality, and the models look really cool.

I like the Tallarns as well, but the models are expensive.

I play 40K, and with the new allies rule, I am considering getting some Catachans so they can act as a speed bump to take some pressure off of my Crimson Fist space marines.

It used to be Mordians for years, chiefly because they were the coolest unit in the old Final Liberation game, but in the past weeks my focus had clearly shifted to the Valhallans. I've always been somewhat interested in WW2, and since the Valhallans are basically 40k's version of "Soviets in Spaaace", this was a huge bonus. In my mind, they've got just the right amount of grimdark for the setting - determined enough to sacrifice countless lives in service to the Emperor, yet not as over the top like, say, Kriegsmen in actively having a death wish. Plus, I also think that the Soviets had some rather fashionable uniforms, and naturally this allows for some carryover to Valhallan IG regiments.

Once I had considered the thought, I was reading up some more on Soviet military doctrines and a few journals/interviews of veterans. One of the latter, the story of the sniper Klavdia Kalugina, eventually inspired me to create a Valhallan sharpshooter: http://dark-heresy.wikispaces.com/Dasha
In further acknowledgement of the Valhallans' real life roots, I gave the character's long las model the name "M91 Mordian-Gaunt", a reference to the Mosin-Nagant M91, the Soviets' most widely-used sniper rifle of WW2.

In addition to Valhallans and Mordians I also like Praetorians for their shiny uniforms and "very British" appearance. Just replace the Zulu with Orks and you're there! Cadians come in at a solid 4th place for me. They're a wee bit modern for the Imperial Guard and probably one of the very, very few regiments I could see equipping its soldiers with all the stuff that the Beta rules hand out to everyone, but as I also like Vietnam movies and Cadians in Valkyries, they are the perfect army for this style (no, Catachans are Rambos, not 'Nam troops imho).

 Add one more vote for the Valhallans. The shear grit and determination of these guys and gals is amazing. I also like the fact that they do winter warfare, and the background of how Valhalla came to be the wreck the Winter Guard comes from is very inspiring.

Vostroyan Firstborn for me. Awesome uniforms and great fluff.

Oh yeah, chalk me up for Praetoria. It might be biased since Zulu is my favorite war film of all time, but I just love the whole idea behind them and something about them really clicks for me in terms of the concept "Imperial Guard" and all they stand for. You can't imagine the smile on my face when I saw the words "Front rank, FIRE! Second rank, FIRE!" in the codex.

Also, watch this scene and tell me it's not fitting of this game setting. Such a perfectly fitting line.

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 Valhallans, Death Korps, and Elysians are all awesome.

But the best is the Tanith 1st and Only. Gaunts Ghosts. Nothing else need be said.

Without a doubt its the Roane Deepers, when they crop up in the Gaunt's Ghosts novels they have always been cool.  I especially remember the fact that they are described as not being brillient but that they are dependable and generally skilled and that every other regiment would like them at their back.

I've always liked the praetorian models (sadly unavailable now if I'm correct) and as a result I've been collecting an imperial guard army based on cadian bodies but with either pith helmet heads or those australian hats (the name currently escapes me) with the pith helmet headed troops being painted a navy blue with white or black helmets (white if they are officers or NCOs, black for enlisted) and the australian hatted (slouch hats?) troops being painted a sort of sea/moss green.  I've basically moddeled them off the Natal Mounted Police Contingent and the native mounted troops from Zulu Dawn.  Some red painted infantry are on their way as are some field artillery (the guns from forge world) based off a picture I found of the orange free state artillery corps.  My regiment faces off against my friends dark eldar on a regular basis, we thought about guard vs orks but thought it was a little hackneyed.

I'm another fan of Praetorian and Elysian Drop Troops. Also the Kasrkin, ever since reading "What Cadians were born to do" in Malleus.

 not to sound vainglorious, but my favorite regiment is going to be my own Mephidross Deadwalkers. They're a Penal Legion from a World created specifically to raise Penal Legions. the interesting thing about the Deadwalkers is that any legionnare who can survive more than 15 as a Deadwalker is freed, pardoned of crimes, commisioned as an officer and placed in charge of other dead walkers. this leads to the rather interesting fact that the Deadwalkers are completely commanded by former prisoners, leading to a nonstandard, though strangely loyal and effective fighting force

antijoke_13 said:

Nice idea for a regiment, but more than 15 what? Minutes? Battles? Campaigns?

For me, my top regiment has to be Drookian Fenguard. Firstly because of the small thumbnail sketch of a guardsman riding a tauntaun-like creature in one of the older Guard codexes (there was a 2 page spread of little sketches of loads of obscure and cool looking regiments), and since then Victoria Lambs Golden Daemon Fenguard conversions and the kilted leg conversion pack she released from them has cemented them as my favourite. If I ever do 40k again (which, with 6th having just come out, I might…) I'd want an army of kilt-wearing, tautaun-riders. :D

 Enemy at the gates much? ;)