I have the exact same chipset as you, digitizedsoul and I am using iPC 10.5.6. I have one IDE HDD and one IDE DVD burner. I cannot get this to work. Right after the install I get this message:
panic(cpu 0 caller 0x001A429B): Unresolved kernel trap (CPU 0, Type 14=page fault), registers:
CR0: 0x8001003b, CR2: 0x000000fb, CR3: 0x01123000, CR4: 0x000006e0
EAX: 0x0bfdcbb4, EBX: 0x0bfdcb80, ECX: 0xffffffff, EDX: 0x0c12a800
CR2: 0x000000fb, EBP: 0x48353df8, ESI: 0x0971ab00, EDI: 0x0bfdcbb4
EFL: 0x00010206, EIP: 0x00592be9, CS: 0x00000008, DS: 0x0b490010

I also get a lot of the IOUSBOHCI OHCI controller will be unloaded messages.

What am I doing wrong? Any help will be greatly appreciated