I just bought the:
Giga-byte nVIDIA GeForce 6800 GT Video Card, 256MB GDDR3, 256-Bit, DVI/TV-Out, 8X AGP, Model "GV-N68T256DH"
from Newegg. I paid $399 for this just last weekend but i looked at it again to show a friend of mine and they raised the price this week to $459.50.
This one is not passive cooling however. it has a fan over the heatsink as well. i have heard that this one can be OC'd to achieve at least as good of performance as the ultra but i hear they run hot so i may just leave it as is.
AMD 64 3700+,ASUS K8N-E Deluxe-250gb,1.5 gb PC3200,Gigabyte GeForce 6800gt 256mb,Audigy 2 ZS , 2-36.7gb 10,000 rpm Raptors/Raid 0, Thermaltake butterfly 480 watt PSU , + asst. other amenities.....