i think to buy a gpu. well, my problem is this:

i already have an gainward gtx570 phantom and im not far away max out c2. i thought ok, to got out cheap, i buy a 2nd and make a SLI. but still now, this gpu costs 260€. an evga and another gtx670 at stock costs 350€ and an zotac gtx670 amp 420€. i cant decide, to go in sli, which i except maxe out c2 and coming games, or invest in a 670, and i dont really know can max out everything. if the gtx570 would be just under 200€, then i would say, perfect. i wonder that it still costs so much.
the next is, i will look if i can sell my gtx570, then i think i am ready to buy the zotac gtx670 amp.

what do u think?