To add to the 'suggested case' department, here's a few nice Mini-ITX cases that I think everyone would find agreeable.
1.
Bitfenix Prodigy
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great reviews. looks great. can fit huge GPU's, and a full watercooling loop. you can get this case in black or white for around $99
2.
Coolermaster Elite 120 Advanced
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not bad looking, and the ventilation is good. Smart design, too. You can pick this one up for around $59
3.
Silverstone TJ08-E
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arguably the most popular M-ATX/ Mini-ITX case in 2012. Great airflow, and looks quite nice too. Good Cable management. price is around $99
4.
Thermaltake Armor A30
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This one's more on the flashy/showy side of cases. I'm personally not a huge fan of Thermaltake, but those who've purchased this case seem to like it. can fit big GPU's. unfortunately, it's a little more on the expensive side, at around $119
5.
Lian Li PC-A04
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exceptional airflow/cooling. sleek design. good quality manufacturer. Air filters. Can fit any GPU. Is styled a little bit like the more conventional ATX tower style cases. This one's the most expensive of the bunch, at around $135
The cases I've listed here all have great airflow, look nice, and will accommodate pretty much any components.
Plus, they won't break the bank either. As Zen said, you can't completely disregard heat as a factor in the longevity/optimal performance of computer parts. Good cooling is crucial.
I think you'll find at least one of the cases I mentioned agreeable
good luck.