@ 8800gts or 1 260?

Not really. SLI is not very consistent in its performance (works great in some titles, doesn't work at all in others). A 260 is also ~50-60% faster than an 8800 GTS 512MB at stock clocks, and it's rare you get better than a 50-60% performance boost from SLI even in best case scenarios.

I would not recommend SLI with anything but top end hardware -- i.e. a pair of GTX 275/280/285s.

A single GTX 275 or Radeon HD 4890 would be faster than a pair of 8800 GTS 512MB in all cases and draw less power, while allowing you to avoid worrying about SLI support and giving you more motherboard options. I'd seriously consider going that route instead. It wouldn't be much if any more. If those are out of budget a Radeon HD 4870 1GB would be almost as fast.

What size / resolution screen are you running, and what games do you want to play? If it's not a 24" LCD or larger (1920x1200 or better resolution) forget SLI. It is not a good option for you.
 
Default 1920x1080

The 4770 is about as fast as a 4850, but not quite, and you can get a used 4850 for less than a 4770... so why consider the 4770? You're running 1920x1080 so you'll want more than 512MB of video memory. I'd be looking at 4870 1GBs and 4890s primarily on the ATI side and GTX 260s / GTX 275s on the Nvidia side.
 
Thanks, I will go for a 4890, any you would recommend?

XFX brand has the best warranty/customer support so I would recommend them. HIS and MSI seem to be the cheapest currently, assuming the MIR arrives.
 
From what I've heard you'll get your MIR from MSI, but probably not from HIS.

XFX has the best warranty, but ASUS supports voltage tweaking via software natively (not that you should be messing with that if you don't know what you're doing) and Sapphire has better cooling options (via their Vapor-X line). I'd probably just go with XFX, but consider MSI or Sapphire if you want to save some cash.
 
The new EVGA GTX260's (55nM) dont support voltage changing.
Only the older 65nM versions support it.
fyi
 
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