Or try selling your 7750 and get a 7870 LE :-) 7870 LE almost out-performs the 7950 at some points (defenetly price/quality wise) even when oc, competes with a gtx660ti
LE is just a Gimmick.
And comparing Overclock 7870 to a Stock 7950 is Stupidity.
You can Overclock high and Leave the Overclocked 7870 in the Dust. So, getting 7950 over 7870 is worth it.