Well if you want a higher clocker I think the E7400 will do better in that department with that said its really hard to turn down a triple core w/ 6mb cache. Just go AMD
I'm not sure how much difference the 790GX board has over the 780G boards, apart from the onboard GPU and the colours. though I think that 790GX boards is one of the best looking boards out.
Also, they have 6 chokes next to the CPU, so should support very high-powered chips, as well as some high overclocking headroom.