Are you sure that your motherboard doesn't have IDE as well as SATA? Most have.
SATA DVD/CD units are very few (if any). If not, I am sure you can get an IDE/SATA convertor plug. Most places sell the PCI IDE cards that you talk about.
What motherboard is it?
The Asus K8VSE Deluxe has:
2 x ATA133
2 x SATA, RAID0, RAID1 Promise R20378 RAID controller
1 x UltraDMA133 supports two hard drives
2xSerial ATA RAID0, RAID1, RAID 0+1
If it wasn\'t for Electricians you would be using your computer by candle light
Athlon 64 3500+
ASUS A8V-E Deluxe Motherboard
2x512MB 400MHz DDR Dual Channel
Gigabyte X800XL - 256MB Mem
Maxtor Y160M0 - 160GB SATA
Maxtor 80GB PATA
Xaser III Case
Win XP Pro SP2
ViewSonic VX924 19\"LCD 4mS(ish)