GamePC Gainward 750 Review. Good read, compares against VT 4600, 8500, Ti500, Ti200, GF3 etc... finds an issue with the 2 DVI connectors... 1 can go to max res, 1 only to 1280X1024.
Personally I might get in on the Evga 4600 card... its clocked to 330/660 stock, heatpipe cooling for mem on both sides of the card and GPU... also has the trade up program. Given the fact that @ 330 it supposedly runs between 8-10C cooler than a VT 4600, I'm betting that it should be one of the highest OC'ing cards of the bunch.
FYI I checked out United Micro... the merchant has a horrible rating on ResellerRatings and also with the BBB.