I have to agree with Tim. Without any previous knowledge, I ordered all the parts I wanted from Newegg back in May, and put the whole thing together myself. It's a bad ass computer for a very cheap price. You save a lot of money building it yourself and you also get that sense of accomplishment and pride that your computer is your baby. Plus you know what it's capable of. I would suggest to just order all the parts and put it together. It's really not that hard, if a Jar-head can do it, so can you. BIOS is an important thing to learn though as I had to update mine and go into it in order for the mother board to read the new processer.
~Semper Fidelis~