holy crap i almost died with shock reading that.. PLEASE do not spend money on a 7300.. escpecially 2 !! ahh lol
Like jaguarskx said earlier it would be better to go with a 8800gts and spend about $250 rather than $230 or so for the sli 7300 cards.. The 8800gts is like again was said before, at least 10x as powerful.. the 7300 cards in sli would barely be able to run crysis at the lowest settings, if at all actually. If however you go with a 8800 gts you will be able to play Crysis (not Crisis) at medium-high settings.
of course you need a good 500watt power supply unit to run this card, so if you dont have one you will need to upgrade. They are about $80 for a OCZ or Corsair brand.
I linked to the american version of ncix because the Canadian version has everything listed for a huge amount more.. even though the Canadian dollar is worth more than the american dollar.. (fubar imo)
$268 for 8800gts- http://www.ncixus.com/products/22631/PVT80GGHF4/XFX/
$77 ocz 600watt psu- http://www.ncixus.com/products/23934/OCZ600SXS/OCZ%20Technology/