I know its breaking the rules but I'm sure you could bum $31.92 for your system to be slightly more future proof. I have 7950s in crossfire and they are awesome!
As of this post, Logan has recently released a $450 APU-based KYC (Kill Your Console) build. He stated that he would be making a $600 build, and I'm interested in what that will look like.
This is similar to what I had in mind. With the 955/965 phasing out, I was looking for a worthy successor. It appears that the 750k may be the answer.
However, I think that it would probably be worth pushing up to $600 to include the FX-6300, and I'm wondering if Logan's $600 build, if it does come out, would include it.