I believe you have a micro-ATX motherboard but I'm not sure that your PSU is a full ATX size (I'm gonna guess TFX size PSU) - there are adapters available if needed to continue using that PSU in a new case.
Here's what I'll suggest though... Look over computer cases and give us an idea of what you like as far as looks. Since case selection is mostly an aesthetics thing (after all, you'll be looking at it, we won't) that can give us an idea of what you want.