Okay, I set it up yesterday, and everything seems to be working fine. The onboard sound and network are functioning without problems. And it's nice and quiet.The two PCI slots are occupied by a card for the card reader and a dialup modem in case of emergency; I have the Zip-250, a DVD-RW, the card reader and a floppy in four of the five front bays.
I've installed 64-bit Windows 7 RC1 in a 500GB partition of the 1TB SATA and I'm planning to put 64-bit Ubuntu 9.04 in the free space. Wish me luck.