I would change the case, because with Antec you don't have CPU cooler cutout on the motherboard tray, no PSU cable routing behind motherboard tray and it has grey interior (well this is personal view, but atleast i prefer black or white interior).
Check out the Bitfenix Shinobi (there is one with window aswell). Well build and it's gotten some nice reviews aswell. And it has the cable routing, cooler cutout and black interior.
Other than the suggestions already thrown your way, I'd change the case to a Fractal Design Define R4. It has plenty of airflow, has a cuttout for your CPU cooler (meaning you won't have to take out your motherboard), plenty of room behind the motherboard tray for routing cables, is very quiet (due to the sound dampening foam found inside the case), and has a sleek and elegant look. I bought myself one not too long ago, and it's a dream to build in. Although if you're wanting a slightly cheaper case, with most of those features, the Bitfenix Shinobi that Pupp suggested would also make a fine case.
Bitfenix Shinobi comes with one 120mm fan and Fractal Design Define R4 comes with two 120mm fans. If you buy Shinobi, get atleast one 120mm fan and put it in front of the case, with 2 fans you will be alright. Ofcourse the more you have fans installed the more you get airflow through the case and get better cooling.
If you don't care about how much the fans make noise, get cheapest ones. If you want quality fans with low noise i'd recommend Noiseblocker and Noctua fans, ofcourse there is more good brands, but i've experienced with those two and really liked them.