homework on parts. I have built all my own for years. You don't always save money, but, usually you do and you get just what you want. The first one is a little scary, but, it really is not hard to do.
Newegg is a great place to start for components, but, don't assume they always have the best deals on all parts. My last build was comprised of parts from Newegg, eBay and a couple of other online retailers. There are plenty of rebates and bargains to be had at this time of year.
Here is a link to the Newegg Black Friday deals page:
http://promotions.newegg.com/black-friday/index.html
You could build a very good computer from just the Newegg Black Friday deals!