I have 5 HDDs, Athlon XP 2000+, 256MB PC2100, Asrock k7s8xe+, CD-RW, matrox millenium, realtek 8169 Gigabit and onboard 100Mbit on my Antec SL 300.
My main PC has the same motherboard, 512MB PC 3200, geforce3, 2 HDDs sound, gigabit realtek, onboard LAN.... Fortron 300watt