I'd strongly suggest against the Antec 900.
tight, little room for the install, JFP1 and USB cables are barely the length needed, and the whole "power supply on bottom" thing doesn't work elegantly with either the Antec Neopower HE550 or the Corsair HX520, with the CPU 8pin cable being horrifyingly stretched across the case.
Cable management is, also, well, nearly impossible.
Similarly, the holes for the motherboard standoff don't seem to have been drilled quite right, leading to my cards not mating with the expansion slots properly (on any of 3 motherboards I've had in the case) and thus making me constantly worried that the card will pop out while the system's on and destroy things.
Nice looking, good airflow, decent size, stable, seems durable... but I hate the thing with a passion.
Coolermaster HAF932 has been popular for extremely good airflow, but no removable motherboard tray.
I think I'm going to save up for a Lian-Li V1100 series case.
Notice that it's power supply on bottom, but the motherboard itself is completely inverted such that the connectors are probably still on the "right" side of the motherboard. Best of both worlds:
http://www.newegg.com/Product/...x?Item=N82E16811112060