wow that is a a great price on a awsome case.... here is some info on the SX series i got from Antec Customer Support.
The Antec SX series comes in a bunch of different variations.
1030 -- 300W PSU
1035 -- 350W PSU (only seeing this at Compusa)
1040 -- 400W PSU
models ending in 'B' are black cases. You might see a 1050 (500W PSU), since Antec just released a new PSU. According to customer support u can get any case with any power supply by calling them up. So the SX cases should all be the same just different PSU.