I bought my brother and friend 10 Gig iPods for Xmas. They both have 3-4 year old Dell Desktops without FireWire and USB2. Can someone please recommend an affordable FireWire card that is powered? What's the difference between Powered and UnPowered ones? Are the unpowered ones the ones that use the iPod adaptor. I just want to make sure I get a powered one. Thanks in advance!