dude, sorry but for the last time you need to post your advertisements in the appropriate sections. Yes, even just a reference to the fact that yours is for sale.
I would keep your eye on the 9800 GX2. It's a little pricey at the moment, but that price may shift very soon. Not to mention the new 9900's are coming. Actually Nvidia just announced that the 9900 series will be called GTX 260, 280.. etc.
Although many popular games are nvidia optimized they will still work with ATI cards fine. Besides crossfire scales better than sli in general. the 3870x2 is a great deal go with it, even in the games it does worse in, it still gets great performance.