Sapphire HD 6870 and Corsair 650TXV2

A couple of weeks ago I asked here for advice regarding an upgrade from my underachieving 1GB GT240. It appears that my PSU is not capable of supplying for a decent card so I'm upgrading that too. After some research and thought I've almost made a decision, but I wanna be sure it's a good choice.

I'm looking at a Sapphire HD 6870

http://www.amazon.es/gp/product/B004R7MTPQ/ref=s9_simh_...

and a Corsair 650TXV2 PSU

http://www.amazon.es/gp/product/B004NRVXK2/ref=s9_simh_...

Should I just go ahead with these two? I'd wish to get a dramatic performance improvement from the GT240, and I also wanna make sure that the PSU will do its job.