Like Vapor, this is a guess, the X800XT is the best bet IMO for the ultra-near-future (3-6mth or less), then (6mths to 1_ year) who knows, then (1+-2+yrs) the structural advanatages of the GT should be benificial in most applications as we move towards Longhorn with it's DX10/DXnext focus.
There are advanatages to the GF6800 architecture, but right now they aren't fully exploited and the the XT/XTPE tend to lead under many situations. For the long term my leaning would be GT, but it may be like saying the FX5600 is more future proof than the GF4ti, in threory that's true but in practicallity the advanatages aren't significant and buying a better card newer card when the advanaced games arrive may be the best solution.
That's my view of the future, but like VAPOR says, there's no way to know for sure.
EDIT: Yeah and if this is focused on video editing these are both far more cards than you need for that, if you just want to do some video editing with them but mainly play games, then they will both do very well. The GF6800 has some addition encoding/decoding features but does not support HDTV now or in the future unlike was planned because of a hardware issue, so if you are thinking of going that route long term, then you might have to go with the X800, but really I wouldn't worry about it, just think about getting an RGB/DVI compatible HDTV. For DV editing I don't think there is an advanatage to either, image quality is good on both.
So for games + some editing, then my initially recommendations stand, for only video editing then go Matrox P650, for ALOT of both, get two seperate rigs like me.
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<P ID="edit"><FONT SIZE=-1><EM>Edited by TheGreatGrapeApe on 07/07/04 04:07 PM.</EM></FONT></P>