Well... I just finished building a 2.53 P4 system for a customer. Here is the specs.
Albatron PX845PEV Pro
2.53GHz P4
1GB PC2700 memory Kingston HyperX (2*512MB)
200GB Maxtor 7200rpm HD
GF4 Ti4400 VIVO
Samsung 16X DVD-Rom
Pioneer 4X DVD-RW
Floppy
Viewsonic VG700 Flat panel monitor
Logitech Wireless keyboard/mouse
Windows/Office XP Pro
Epson 1660 Scanner
Epson C82 Printer
Misc. Roxio Software packages.
Misc software that came with various hardwares.
All wrapped in black/chrome/Metallic grey

1yr warranty
My price for him, $2600
You can get all that for about $2000 or less since you are doing it yourself and you do your shopping correctly.
Dells price for a unit configured the same $3200 + shipping.
You can always have the price lowered by going with a different monitor and exclude the printer/scanner. Might save you an additional $400 off.
The performance is great. Do not know about the reliability as of yet. But I expect no problems of it... I do not like putting 'junk' together as it is my 'name' I put on the line.
Sorry, it is no longer in my hands so I can not report its benching speeds. But it is in fact a fast computer.
I also think you will do better with an Intel chipset rather instead of a SiS chipset... but that is my opinion. Others may disagree.