ya the 6800gs, 7600gt are above his budget.
i suggest this card.
ppl around here seem to have a problem with XFX, but the newegg reviews seem to be good, so i guess not too many ppl had problems with this card. it looks pretty good.
if you really want eVGA (ppl here swear by them) then get this one. its a bit cheaper. but the memory is quite a bit slower than the XFX one. also, the xfx has dual dvi unlike this one.
if you can increase your budget to $170-$190 or so you'll get great cards there.
btw i think this is the first time i heard someoen trying ot put 2 7300gs' in SLI. lol.. can those cards even do SLI?! definitely do not do that!