I think you will have trouble finding a replacement for the PSU because of the power plug placement. If the PSU works, it looks like an amazing price for a micro ATX case with PSU. Even comes with card reader.
I just recently purchased a couple of these cases. I did not realize the power supply issue until I opened the case.
I have contacted Xion Support and am waiting for a response as to how to replace the power supply.
If I get an answer I will let you know.
Also, the case is pretty nice. Holds a full size optical drive and one 3.5" HDD. Has two front 2.0 USB and one SD port on Front Panel.
Since it is made of steel, it has a nice "solid" feel to it. The panel is glossy and looks nice. It also comes with two "feet" to stand it up on its side so you do not have to keep it flat.
Aside from the power supply issue, I am pleased with this case.
Just curious, why are you replacing the PSU? Why not just buy a difference case to start with?
BTW, I think the PSU is a SFX/micro-ATX, the cable is a little hard to come by. But if you don't mind the the hole left behind, can't you replace it with a standard PSU and just run the power wire directly to the PSU from the bottom? You may need a right angle PSU cable if you need the case upright though.