Very good choices. Here's a similar deal for the 6870 at amazon: http://www.amazon.com/gp/product/B005C31F2M/ref=ox_sc_act_title_1?t=slicinc-20&tag=slicinc-20&ie=UTF8&m=ATVPDKIKX0DER. I like sapphire which may run a little quieter.
That's a pretty good setup. You didn't mention what you plan to do with it (i.e.games, internet, CAD) but it should handle just about anything. It's really above an "entry level" setup. However, very nice selections.