Actually the reason I won't build this one is price. They're offering a P4 w/ 256 MB of RAM, 40 GB hard drive, and etc. for $595. Everything except the monitor. I've built several computers, but by time I'm done they always cost at least $1000. The last one I built was over $1500. This was probably about 1 1/2 or 2 yrs. ago. I used an Intel D 815 EE motherboard, a P3 933 CPU, 2-256 MB DIMMs, dual 7200 RPM Western Digital 30 GB hard drives, SCSI internal tape drive and external CDRW, and IDE DVD and CDR drives. And all the other usual junk, the video card was an ATI Rage Pro 128 (32 MB vRAM), modem, case, , floppy drive, keyboard, mouse and all that stuff. It adds up. And right now, I'm kind of hurting for cash.
But if $600 can get me a halfway decent Linux box, I'll do it. If $600 only buys me headaches, well, I won't go that way.
Another reason is that if they build it and install the OS, then there can be no hardware compatibility issues. I'd hate to buy a bunch of components and then have try to figure out if I'm having hardware problems or driver problems of configuration issues or other types of problems if things don't work out well.
You asked... these are the reasons
Jim