Which amd video card should i use for gaming?

an hd 6k series graphics card? is there any other option? which one is newest and bang/buck for gaming?|||I just bought a Sapphire 6970, its the best card I ever owned. I guess you could wait for the Sapphire over clocked version, the 6970 TOXIC or wait till the dual GPU 6990 rolls out, or wait for the Sapphire 6990 TOXIC. Right now the AMD 6970s are the best out right now. Except the Fastest card out now is still the Sapphire TOXIC 5970 with 4GB of GDDR5 memory clocked @ 900, and needs 850 watt power supply to run.|||HD 6870 is a good card. Though, it preforms the same as a GTX 460 anf the 460 is a little bit less. The 5000 series is great too. If you really want a new card that is really good, then the HD 6890 is the way to go. But seriously look at the HD 5000 series, they are a little better than the HD 6000 series.