I have a Seasonic SS1250XM power supply (it's a big one) and a Radeon HD7950 GPU. I'm looking for an inexpensive but solid case and CPU that will turn this into an ok gaming rig. Will any $60 or cheaper Mid Tower case work? Does it make sense for me to go any smaller than that? Any specific recommendations for a case? Also I have a second Radeon HD7950, which I need a power supply for. I'd like something much less expensive than the Seasonic SS1250XM. From what I understand, I would need at least a 500W power supply. Any recommendations for that?