I'm not very familiar with AMD parts, but 8 cores @ 4.0ghz is pretty beast. You could probably save and get a cheaper processor and just overclock it to 4.0 ghz anyway. And i don't know what your plans are in terms of how high you want to overclock, but you could also save a few bucks and get a standard heat sink/fan instead of the Hydro.
Unless you really want those things. I mean I have parts that are way over the top in mine, but that's just because I like tinkering and upgrading.