Nothing is wrong with the case, per se, but I can guarantee the quality of the ArmorX is much higher. I see a lot of cases that are 'cool looking' and have their own PSU (yes, power supply) ending up to be substandard. If an attractive case is a high priority for you, I say why not get the best?
The motherboard you chose is just a reference board for a G33e chipset, which is primarily for entry-level PCs. Very low scope of options there, especially OCing. The Asus P5B (P965) is a very good board, The Asus P5K(P35) is even better... but has some maturity problems. If you care about capability, one of the two I suggested will be what you want.
There are two things wrong with that CPU. First, it's a core2 quad, which saturates your FSB quite easily, and has lower tolerance for failure. Add on top of that some 20% of OEM (original equipment manufacturer, a misnomer in the computer industry) CPUs are DOA. If a quad core is important to you (it's not, unless you have a rendering farm), then at least go with retail. I think an E6600 would be a much better value. They're pretty cheap.
Just because the board can use 8 gigs of memory doesn't mean your OS can see it. If Windows XP can see 3072 MB, no amount of hardware can change this. XP64 can use the full amount of memory, but that's a terrible hackjob OS.