I doubt he's gonna do a heavy OC on his graphics. Either way, I'd say find a 5770 for $80 or hold out for a GTX 460 deal (not SE). I'm really not a fan of the GTS 450.
No, that XFX PSU isn't modular (which is nice), but you won't find a good modular PSU in the price range we're talking about.
OP--I don't trust your PSU, but if you already own it you're probably not buying a new one.