well, to be honest with either processor, you better be looking to overclock because that is where you're going to see the biggest potential these processors have to offer.
Both can hit above 4.3 easily, EASILY with air cooling, and stock/oc performance is kind of significant if you see the benchmarks. but if you're not interested in ocing, they're still great processors @ stock.
The Core i5-3470 will not hit 4.3 GHz easily. The Core i7-3770 will, but it can't go much higher than that (only BCLK overclocking).