I'm always being asked to make PC systems for people who want to get into Audio Production. So here's my latest recommendation (as of Oct 15th).
ASUS P4T 533-C Motherboard
Intel P4 2.4 Ghz 400/512
512 MB PC800 RDRAM
2 x 40 GB Maxtor Hard Drives
Lite On CDRW 48x12x32
1.44MB Floppy
Matrox G450 Dual Head - for two screens!
Windows 98SE at the very least!
RME Hammerfall 96/52
+ all the usual incl.
Lots of fans/Monitor/Case
Let me know if anyone has any other/better specs!