You cannot directly buy a 6800 Ultra Extreme, they are exclusively available only for high-end systems for Voodoo PC, Northwest Falcon and Alienware. The 6800UE is just a 6800U clocked to the bleeding edge meaning no headroom. Anyway from what I seen almost all 6800U should have dual DVI connectors once you get a unit. Personally, I don't know what's the big rush for X800 and 6800 the only game that it's useful for right now is Far Cry(Doom 3 is coming down road in the next few months) if you want good FPS with uber-high resolutions. I can't find any jusifcation for spending $500 only for that. While, the 9800P/5950U can get by just fine unil next year.
Ivy Bridge i5-3570K@4.0Ghz, Gigabyte Z77X-UD3H, 2x4GiB of PC3-12800, Sapphire RX Vega 64, Corsair CX-600 and Fractal Refined R4 (W). Kentsfield Q6600@3Ghz, HD 4850 2x2GiB PC2-6400, Gigabyte EP45-DS4P, OCZ Modstream 700W, and PC-7B.