Right, even though time has passed, the OP needs to have more than 3 hours patience. People get put off with attitudes like that. We all have lives to live, and right now a lot of the forum seems to be busy with life. Sorry to tell you that if you don't want to hear it, but it's true. ;)
That said...
If you can run with mixed-monitors or a DisplayPort->DVI adaptor, then EyeFinity presents you with a few advantages that nVidia Surround does not. It will also end up costing you a lot less money overall as going nVidia Surround isn't a cheap proposition.
Basically, if you want to stick to nVidia, you need to think about selling all the cards you don't want to use, and buying any one of three options:
2x 2GB GTX560Ti - this is the 'budget' option. You'll get a fair amount of raw grunt, but some games will just walk all over the 560, as it can't put enough raw power to bear.
2 (or 3) x 2.5GB GTX570 - mid-range option. This is what I'm thinking of moving to, as I've struggled to run stuff at framerates I'm happy with recently. It's a good balance of price, power and VRAM.
2 (or 3) x 3GB GTX580 - high-end option. Not for those afraid of making the wallet light. Essentially, you're paying anything upwards from a 30% premium compared to the GTX570 2.5GB per card for what amounts to approximately a 10-15% performance boost and an extra 512MB of VRAM.
Getting any card with less than 2GB of VRAM for Surround, and you'll wish you hadn't. The 1.5GB of the GTX480/580 will just about cut it, but for demanding games, you'll run into a VRAM wall and watch framerates nosedive as a result.
I know from experience with nVidia Surround (and as you, too, have discovered) that Surround hammers these cards hard. They hit temperatures in Surround that not even Furmark can make them hit in 1080p. Surround really seems to make the whole chip have a workout. If you were going tri-SLI for nVidia Surround, I wouldn't recommend anything less than high-end watercooling (or aiming an aircon unit at the side of your case...)
Not much experience of EyeFinity, but I keep telling myself I'm going to try it sooner or later.
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