Our son has been building ours since he was in about grade 6 or 7 (ie..the last 10+ years) and no longer bothers going this route. He's found we can buy more power for less money just ordering from Dell and have it a couple days later. He does this with all the computers running off the server system at our Plastics plant, as well as many other happy customers. No issues to date with any Dell equipment...other than my wife's $5k lap top..but that's another story.
My current is a Dell Dimension 5150C..2.80Ghz/800FSB/1GB Dual channel SDRAM@533Mhz and 250GB/7200RPM serial ATA hard drive. 19" flat panel, 3.5 floppy drive for my old stuff, 8X CD/DVD burner w double layer write capabilty. 56K modem, optical mouse, Adobe 6.0/Corel photo/Firewall/Sound card all installed. 1year onsite service etc. $1368.10 + tax to the door.