I am quite happy w/ my GF 6600 GT, for now.
I think the 7800 GTX is rediculously high in price-- and you are paying for tech' you don't really necessarily need yet, so you do get what you pay for. You pay for being WAY ahead of the game.
I usually only do a upgrade on the vid card when it's a necessity -- when all the modern games I have don't run so great anymore and/or the modern games I want just don't support my card period.
