You could try unlocking if you have already got it, and get lucky with the 4th core if your motherboard supports it, also it would depend on the games you play, and I think the 7750 is a great card without the use of any extra power cords necessary.
and you should wait if you are taking the plunge into amd instead of the intel if you already own the motherboard that is AM3+ capable to see if the 4350 FX is worth the wait instead of the older generation's processors.