I was able to go to Fry's with my $450 budget and made a complete computer nearly from scratch. I saved maybe only about 2 parts from the old computer, such as the drives, which don't cost that much. I am noobish in this area as well, but the reps were able to give me some sweet deals on some good cards and such.
Also, it depends on what you're looking for. If you're not looking to do multiple things at once on your computer, then I would say that you probably don't need 4GB of RAM, you maybe only need one stick of 2GB. My computer is running fine on 1GB, but of course we don't use it for much.
The core and motherboard look good and not too pricey.
If that's what you're looking for in a tower, then that one looks good. If you want to go cheaper, there's several options that you have. I would say that having 4 fans, one from the PSU, 2 from the tower, and 1 extra, may be a bit too much. Unless you plan on continuously running your computer at peak performance, you probably don't need to buy that extra fan.
Everything else looks good.
Of course, remember that I'm a noob at this as well, so my opinion is not that good, because I just simply don't know what's good and what's not. It looks like everything will work together, so I have no problem with it.
