The 6800 has problems playing high definition videos if you don't plan to do that it no big deal. But as you said the 7800gt is a killer card (only surpassed by the 7800GTX.

I would love to say that that card would last a long time but we all know GPU are gestting old fast. Seems that my 6600GT is just slow(compared to 7800) and I bought it 4-5 months ago.

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Not in the mood for cheese?
That excuse has more holes than a slice this fine Gorgombert!