If you're looking for value - I bought this:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814150365
... and it is fucking sweet. $15 more than what you were looking at. It's basically a slightly kicked up version of that same card.
If you're already spending that much, consider going up one more step.
Well, I was looking at the GTS line, but I'm wondering if they deliver any significant performance boost. Spec wise, it's barely faster than what I have now, and if I'm getting SLI anyway, is it going to matter. Screens of my current card specs:

As you can see, the GTS 250 isn't *that* much faster. Whether it gets better framerates or not, I don't know, but I doubt the small increase in clock speed on paper will translate to any real world gain. I've also seen benchmarks showing that the 9800GTX+ isn't that much faster either. The main thing I have against buying another 8800 GT SC is that I will have to track one down, and it will cost more than what I will pay for a 9800GTX+ or a GTS series card. By way of comparison, here's my friends card(s) which he paid 95 bucks apiece for about 4-5 months ago. I wish I would have had the money back then, it would have been fine to have a couple of those.

I've already resigned myself to the fact that prices go down, that's the way it is. One of the reasons I opted not to wait for DX11 is because it's anything like the disaster DX10 was, there won't be much mainstream support for it anyway. Crysis is the only modern game that *requires* more than one video card anyway. I'm going to use SLI because it will make my games smoother overall. I dunno about a GTX275, I'd have to see how it performs versus an SLI setup.
I'm going to have to track some benchmarks for some of these cards. All I really want is the best bang for my buck. A current SLI setup should easily last me 2-3 years, and then I'll upgrade again.
Edit: I'm making some money today, so it's possible I might be able to afford 2 of these:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130433Or should I just go with a single GTX 275 as kyanwan suggests? Ah, decisions, decisions...