Well I'm sure we would all help you build one. We all have little niches that we have more experience in than others. Everyone can add their input and you could build yourself a monster of a machine.
I guess the key question at this point is how much can you or are you willing to spend on a machine? You can get a pre-packaged machine for $500, but you are really getting what you pay for. Building a computer can be a little bit more costly, but the results far compensate for the price. There is middle ground between these. There are barebone kits out there that can get you started in the right direction and then you can customize to your own taste.
I, myself, will not buy complete computers anymore. I have to visit too many friends' and familys' computers to fix them. I see what paying less got them. Building a machine also gives you control on what you get. To cut costs with manufacturing, companies mass produce computers that are all the same. Sometimes you get things you don't want or don't want to pay extra for. Building eliminates this.
