Best looking and cooling case under $150

Solution
You might want to consider the Fractal Design Define R4 for a clean look. It also has sound-dampening pad all over the inside so it's very quiet.
If you're not into the sleek look, then you might want to look at the NZXT Phantom (full-tower version) or NZXT Phantom 410 (mid-tower version). It offers a more unique design than the standard sleek looking cases.
The Bitfenix Shinobi has a more box-y look to it but it doesn't look like your standard case:
You might want to consider the Fractal Design Define R4 for a clean look. It also has sound-dampening pad all over the inside so it's very quiet.
If you're not into the sleek look, then you might want to look at the NZXT Phantom (full-tower version) or NZXT Phantom 410 (mid-tower version). It offers a more unique design than the standard sleek looking cases.
The Bitfenix Shinobi has a more box-y look to it but it doesn't look like your standard case:
 
Solution