@ Sep: Okay, I'll say go with the second option, as you already have one SG polity. I personally would not want to run the SG teams, Wraith and Imperials, it'd be total carnage. The amount of antagonism would be tremendous, the counterpoint though is that they are aware of the Ori and could help make anti-Prior weapons.

@ Matt: Did you still want to take Babylon 5 Excalibur type class?

For my second I am deciding whether to take Transhuman Space (I need to re-read the RPG again), Mindjammer 2nd Edition (again only skip read but looks cool) or possibly a Phase World ship (Palladium RPG). But I may veto them myself as being a little bit overpowered (they're 40K-esque, but they have magic, psychic powers, huge robots (oh my!) and other shenanigans.