What would you recommend for a computer case?

I am having someone put together a computer for me, but am unsure about the case he was going to use. There are so many cases out there, it is difficult to narrow it down to a few. I am planning to use 2 Hard Drives: a SSD for the Operating System, and a conventional drive for the data. The Motherboard presently is an ASRock 275 Pro3 LGA 1155 Intel Z75 HDMI SATA 6Gb/s. For the PSU, presently an APEVIA ATX-AS520W-BK 520w ATX Power Supply. I'm not much of a gamer, so I believe a mid-tower would be fine. Want to keep the price relatively low (so I can afford other quality components). Not overly concerned about appearances, but will insist on excellent ventilation / cooling. Any specific models (or even manufacturers) you can suggest would be very helpful. Thank you.