I had a 965 before I went intel, and it was beast. As for deciding over a FX processor I wouldnt says its worth it to go with the 4300, or rather any other FX. It just doesnt offer anything that the phenom series cant provide.
Owning two Phenom II X4 955's, I still love them to death
But, as I've said in my first post, they're on-par with each other. Go for the one you can afford