Same boat here, I'm waiting to see what the 4870 offers, even tho that Best Buy deal has me salivating. You should at least see what the 4870 offers before jumping on the 4850. For my tastes, the 4850 runs a bit too hot. Even waiting to buy a 4850 with a better cooling setup is an option, as 80c is not good (seems like AMD's thermal compound application is suspect in a lot of cases).