I second using the Genesis 9000. It's different from the rest because both PSU areas are on the bottom. One is actually in the front of the case and simply has a pass-through cable that allows you to plug it into the back. Plus, it's an awesome case, which I assume you want since you're building a system worthy of two PSUs (or 2 systems in one case?)!
In fact, if you are thinking of two systems in one case, you could always go for the super huge cube cases like the MountainMod cases or maybe this one: Lian Li PC-343B Modular Cube Case (http://www.xoxide.com/lian-li-pc-343b-case.html)