Rare used to be one of my favorite devs back in the late SNES, N64 days, but they have since turned to crap. Nintendo parted ways with them at the right time. PDZ was a pretty big disappointment, and their few games since then just look uninspired and mediocre.
I would say I'd love for Nintendo to buy Silicon Knights, or at least start working closely with them again, so they can get to work on that Eternal Darkness sequel that I have been anticipating for like 7 years now.
Also, maybe Xseed. They did a fantastic job with LKS, and Fragile looks awesome as well. I think I'm going to have to check out more of their Wii games, Sky Crawlers and Rune Factory both look very good.