www.alienware.com have some pretty nice already built computers, they are expensive though but if you want to build your own, you can create a copy of it or go to
www.anandtech.com and/or tomshardware and/or
www.cnet.com to see the top lcd's etc...
wish I had more time, but I really have to sleep (stayed up all night typing essay). Last time I did this, i slept 18hours, lesse if I can beat that.