Sata Firewire Enclosure External HDD Enclosure?

External HDD enclosure? - sata firewire enclosure

I never had to buy an external hard drive rack. I have a Seagate 160GB SATA hard drive I need to connect my computer. Two SATA ports on the motherboard are occupied, so I an enclosure that accepts SATA internal disk, but also links / Working with the computer via USB or FireWire. Suggestions would be greatly appreciated. Thank you in advance.