sapphire 7950's: running 3 per rig, pulling 900Watts at the wall for an average of 1.9MH/s. Current price on newegg is $269 after $20 rebate
There is no way a person can buy a 7950 for $269 and hope to make a profit mining bitcoins. The card costs about 2.7 BTC and will only generate about 0.9 BTC over its lifetime, and that is before subtracting the cost of power.
Anyone considering mining BTC with a GPU will be much better off just buying the bitcoins instead.
I recommend that anyone thinking about mining take a look at the Genesis Block mining dashboard (
http://mining.thegenesisblock.com/) before spending any money. You can see what is available and how much profit to expect.