I'm looking for stability and modest speed (400-500), and the price ceiling is about $40. Also, must have 3 PCI, 2 ISA, and 1 AGP slot. Onboard sound and/or network would be nice. If it has onboard sound, you can eliminate one of the required PCIs, and if it has onboard network, eliminate a required ISA.

NOTE: I'm NOT overclocking because I need it to run very cool with passive cooling and need it to be ultra reliable. Also, I want FAST BOOT TIME!