If you're looking to use the Dolphin I would try to pay a bit more and get an intel i3-2100 or i5-2500k (and obviously a different motherboard compatible with those). According to the PC Gaf thread the i3-2100 matches those AMD CPU's and it also gives you an upgrade path (without having to change motherboard), and from what I hear Dolphin works better with Intel CPU's.
I would also ask
PC Gaf thread for some advice. They have a few builds on the original post but there's nothing best than to state your budget and what you want to do with the PC, as well as posting what compoments you're looking at, and hopefully give you help to create a more appropriate build to your case.