Hello everyone, this'll be my first topic

Since I'll be building a new rig in Q4 2011 waiting for BD/SB-E, I wonder if the first generation of 7xxx radeon series will be outperforming the current last generation 6xxx-series such as 6950 and 6970, or moreover whether it'll be worth the price/performance ratio.
I prefer to keep the topic objective, reasonings based upon radeon past releases, the upcomming 32nm tech, the nvidia 6xx series could also be relevant to mention..