NCIX also price matches, so if you find a better deal use it. This option comes up when you order. Here's one site I used.
http://www.shopbot.ca/computers.html
When I ordered mine, I got them to assemble it. It only cost $25 and it insures everything is up and running. I'm sure I could put it together but if something didn't work, I'm not sure I could figure out what part was fubar. It also lessens the chance of having to RMA a part.