Looking for final decision on price/performance!

OK, I've narrowed my quest for a new video card down to these 6. What I am looking from all of you is what card would you choose.
Looking for the best price/performance. I've included differences for same chipset.

Choices:
Sapphire HD 4870 x2 - $560
Sapphire HD 4870 - $280
EVGA 9800 GX2 - $285
- 600 Mhz core, 2000 MHz mem
EVGA 9800 GX2 KO - $390
- 650 Mhz core, 2050 Mhz mem
EVGA GTX 280 SuperClocked - $460 (same price as stock 280)
- 620 MHz core, 2260 MHz mem
EVGA GTX 280 FTW - $540
- 670 MHz core, 2430 MHz mem

Other information needed: 1000W PSU, 1920x1200 resolution, Q9450, 4GB DDR2 1066. Build will be used primarily for gaming.

Please let me know what your choice would be. I just need help pulling the trigger on the card to get.

Thanks!!

Edit: Further evaluation has taken the KO edition out of the mix.

Best bang for the buck would be 9800gx2. It outperforms gtx280 for much less, far outperforms 4870 for the same price. 4870x2 is faster, but cost twice as much.

Edit: don't count on the $460 4870x2. BestBuy isn't known for timely delivery. You may have to wait months before the purchase that you pre-ordered comes in stock, at which time prices everywhere else should have dropped.

Thanks for the suggestions so far. I'm not looking at the Best Buy cards as I don't buy anything from them unless it's in the store (past shipping issues). I have found the 4870 x2 as low as $520 from a decent site, but of course not in stock right now (and no ETA).

Anyways, I'm leaning towards the 9800 GX2, maybe even going for quad sli (a little down the road).

Anyone else have personal preferences?

edit: shening, i know and it's newegg also --> EVGA 9800 GX2

two 8800GT's pwn a single GTX280 and come close to the 9800GX2 in crysis at a lower price than both of them!