6800 GE? is there such cards? Anyway, if it is 6800GT you mention, then this card would be the fastest among those three. Both XT and LE have some of their pipelines disabled. How much is your budget?
I see I googled. 6800GE has 4 pipes disabled while the 6800XT and LE has 8 pipes disabled. So the 6800GE should be the fastest among those three. FYI, 6800GE is running at the same speed as 6800GT, 350/500.
I would go with the 6800GE, but would still check if it's possible to unlock its 4 locked pipes (altough I'm pretty sure it can't be made).
I have the 6800GT from Asus (Asus V9999GT), it has 16 pipelines, runs at 350/500(1000) stock. I have replaced the stock cooler with the Zalman vf700-cu, temps are now idle: 37 deg. C, load: 49 deg. C but normal gaming temps are around 44 degrees. (now runs at 441/584(1168))