get m-jeri's case from the for sale thread, the apex case is small and already has a 250watt psu.. will easily power ur atom rig.. and looks way better then iball/zeb ones.
Has to be the PANACHE T3300. I got the same for my Atom rig and love it. Panache service is also very good and shipping is fast. They missed out on shipping one IDE cable and resent it when I flagged it to them.
It also does not need a SMPS, works off a DC adaptor like a laptop. So you can reuse the PSU you current have.