because it uses a 9 pin block for the power button (hp a6244n) and i don't own a soldering kitIs there any reason you can't use the old case?
this one? Rosewill RANGER-M - Dual-Fan Micro ATX Mini Tower Computer Case - Newegg.comThat's a micro ATX motherboard and would fit in hundreds of cases--any that are "ATX" or "micro ATX".
Since there are hundreds that will work, you need to shop on the basis of features or price or looks or whatever other criteria you might have.
I had my eye on this one, and it's on sale. The one thing I didn't like, there are no USB 3 ports.
Rosewill FBM-01- Dual-Fan Micro ATX Mini Tower Computer Case - Newegg.com