Look, guys, this is kind of unfair here. You're comparing the lowest price ever seen for a 6800NU to the highest price you'll likely ever see a 6600GT for. Unless you're at compusa on Black Friday, then you can't get a 6800NU for under $250 very often, and usually it's more like $275. The 6600GT, on the other hand, is expensive at this time since its brand new, but I expect prices to fall in line with the PCIe version within a week or so, which is around $180-190. That means that the difference in typical price will be $90 or so. With that kind of difference, it's hard to argue that that the 6600GT is the better deal. Throw in the fact that the 6600GT can typically overclock 20% (600/1200MHz versus 500/1000MHz stock), and you take away a lot of the advantages of the NU. If you can get a 6800NU for $199, go for it, since you get slightly better stock performance and can softmod it, but the other 364 days of the year, the 6600GT is gonna be a better buy.
Personally, I'm just stoked that BFG finally released their 6600GT OC PCIe card. At 525/1050 STOCK with dual-dvi and a lifetime warranty, I can't wait to pick one of these babies up (as soon as newegg gets them). Hopefully, that card and the Gigabyte nForce4 Ultra will be out this week.