Well, for the respective console manufacturers it'd be good if they bought one of the top PC devs (Valve, Blizzard, Epic, Bioware, Crytek), but as a PC gamer that'd be bad for me. So, for me:
Microsoft: Crystal Dynamics (could do with some better exclusive platformers)
Nintendo: Obsidian Entertainment (some good WRPGs on Wii would be cool)
Sony: Either Kojima Studios or Square-Enix's main Final Fantasy devs
For the respective company:
Microsoft: Epic (I don't think I need to say much about them other than "Gears")
Nintendo: Blizzard (Starcraft 2 on Wii :P)
Sony: Crytek (could really push PS3 beyond anything seen before and we know how Sony likes to share code between devs)








