Haha, trivum, I have the same computer
(edit- well, same company and make, but not insides. you catch my drift, right?)
Wow, I didn't think the mobo was mATX. I could have sworn this PC is mid-ATX, unless its a mATX mobo in a mid-ATX case.
With that in mind, if it says it supports mATX then more than likely it will work.
Let me know how it works out, I might want to get a new case. But I am thinking more towards a mod than I am a completely new one.