Competition is a good thing 
IF you aren't desperate for a new card right now, all your current games run fine and you have some power to spare. Then I would say why not wait for the R600.
That way you will be able to pick the one that suits your needs and budget, and hopefully the prices should be more competative. Also there might actually be proper drivers for the Nvidia card for SLI and Vista......

IF you aren't desperate for a new card right now, all your current games run fine and you have some power to spare. Then I would say why not wait for the R600.
That way you will be able to pick the one that suits your needs and budget, and hopefully the prices should be more competative. Also there might actually be proper drivers for the Nvidia card for SLI and Vista......
