Another I'm building a computer topic
Looks good to me. I wouldn't spend that much, but I'm a cheap bastard. But that'd give you a good solid rig, with all the stuff you want (like j00 fancy wireless KB+mouse). Check out the reviews newegg lists for the Alien case, I think the first one. It shows lots of cool pics. The HDD bay is awesome, leaves you with plenty of space to confortably seat up to 5 HDDs. I think I'm a bit jealous... but don't forget, one of these days you'll have to pick up another 512MB stick of memory (preferably the same model, if not then comparable one with same exact ratings) sp you can enable dual-channel. But that can wait.
ExCyber: Yes, a cheap xxx watt PSU is often not capable of performing at the same level as a more expensive one. But that doesn't mean its necessarily bad. Sometimes they rate based on near-top output and not constant. The mid-grade tends to rate more or less accurately, and the highend often (varies by manufacturer) rates their PSU rather conservatively. However, that being said, a cheaper 400 watt PSU could for instance perform on par with a more expensive 300 watt PSU. I think he'll be fine with the one in there. My friend is running much more stuff perfectly off a 330 watt Antec, and granted Antec is great, but I would say the 420 watt is still at least on par as far as constant and max output go.
Gallstaff: There's no chance a consumer graphics card consumes 300 watts on its own. Yet, haha, geez I hope that doesn't happen anytime soon. As Ex said, that's just the minimum recommended PSU they want you to have to run this card. Its to prevent people from installing it on their HP/Compaq/Gateway machines that have a PSU that is *just* enough to power the factory original components and maybe an extra drive or two. I've seen bad things happen when people overtax a weak PSU - depending on the PSU, it could just power off/reset a lot, do other weird things. Could burn out the PSU, maybe worse. Whoops, bit of a rant there...