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Who do you guys think is best to ally with GK? I haven't played as or against GK, but from what I've read the main "weakness'" are:
Weakest shooting phase
Lack of unit variety
Low model count

So, Astra militarum, skitarii or SM, possible blood Angels? I'm mostly guessing, as I've said I haven't played these guys.

Not putting the sisters up there for awko moments?

Yeah, the whole wearing your blood thing seems like a put off.

I'm gonna say Skitarri. The answer is NEVER BA.

Skitarii help in areas you lack.

Because they do what GK do but less pure of it? I wasn't sure if you want to ally to strengthen your strengths or make up weaknesses?

Space marine bikes (white scars or ravenwing)

I normally ally in an Imperial Knight, as the Knight adds what I need.

SJ

I'd say avoid other Marine-equivalent armies; they don't plug the overpriced/model-count weaknesses and they tend to have too much tax on the specialist tools. Skitarii, Guard, Sisters, and the Inquisition can all provide bodies and firepower the GK can't replicate, but the Inquisition also gives you incredible psychic versatility and can bring along taxless low-AP guns like no other.