790i SLI or 680i SLI?

Is the 790i a must-get to play current games (CoD4, TF2) on high settings or will the 680i do fine? Also, will it make a difference if I will be using a single card instead of dual?

Also, is it worth the extra couple hundred for a GTX 280, or does the GTX 260 perform well enough?

Is the 790i a must-get to play current games (CoD4, TF2) on high settings or will the 680i do fine? Also, will it make a difference if I will be using a single card instead of dual?

Also, is it worth the extra couple hundred for a GTX 280, or does the GTX 260 perform well enough?

Fabbyfubz

2. I havn't really heard much about those cards since it seems like the HD4850/4870 are a better value.