Although I respect your AchyBreaky haircut, I must beg to differ.
There are MANY games that see the advantage of higher minimum fps, higher possible settings, and SLI AA with SLI, benefits impossible to achieve on any single card.
They are both sweet, and SLI is obviously the faster of the two. However, I find that the speed difference between the two is not noticable in the games I play. Possibly, this is because I'm not comparing a single GTX to dual GTX's, but an XT to dual GTX'es. I am starting to get the impression that 4xAA/16xAF has a much greater performance hit on the NV cards than it does on the XT, which is what I play at.
I also think you might be missing the point. The question isn't if SLI/Crossfire are the fastest, because they are. The question is whether or not doubling the cost of your video card solution is worth it, for most people I beleive the answer would be no. That being said, I certainly won't rule out the possibility of SLI'ed G71's or G80. I honestly never thought I'd have an R520 based card, but you can see my sig...
did you feel dooped into buying two cards first time round?
Nah, I'm a pretty educated consumer. I knew what I was getting into. Plus, SLI really does rock. I don't want anyone to think I'm saying otherwise. The performance is phenomenal and it's just as compatible and easy to use as a single card. I honestly was just kind of curious about the X1800XT because I felt that it was getting a bad rap in terms of performance because it was late to market. The whole deal with it being late did pretty much bite, and I think ATI needs to get it's act together in that dept, but the card itself is really nice and I am very pleased with it. I didn't check out the XT because I was in any way dissatisfied with my SLI rig. I decided to keep the XT and sell the GTX'es because I already have my eye on next gen. Basically, I felt that I could recoup more of my investment on the GTX'es if I sold them now then later because their value has been plummeting like a rock pretty much since I bought them. I got about 70% of what I paid for them on ebay, which should still be plenty to get me into either an R580/600 or G71/80 card. The XT has proven to be a great single card performer that will keep me happy until my next upgrade, and I feel that the additional RAM over the GTX'es will add a bit to its longevity.