Well...
When the game comes out, I'd be lying if I'd say I didn't want to roll one of each to see what's up.

But as far as allowed PC's... Liking the humans (not necessarily Tau'ri, though basing Tau'ri makes for easy history and gameplay references), Goa'uld and loyal Jaffa...
Not so interested in the Trust or Free Jaffa *shrugs*
Jury is out on Asgard. Something about constantly running about in the buff.. in the middle of space... in a metal ship.. seems...
chilly.
But for text RP, sky's the limit on characters to play... No sense limiting ones' self to human/jaffa/asgard/goa'uld. Other races out there: Furlings, Nox, other humans, Ancients, Wraiths, other.. lesser known aliens.