It would be easier if you had continued your previous thread, then we wouldn't have to click back and forth to see what it was all about!
Not quite sure why you're going for an external drive. From what I can see your PC has USB ports which are unspecified, so they are probably 1.1, not 2.0, standard. The Iomega drive will work on USB1.1 (the others don't say), but if you want the extra speed which USB2.0 offers, you'll have to buy a PCI/USB2.0 card as advertised on some of your sites. Then you'll have to open up your PC to fit it, and you might as well fit an internal (and much cheaper) HDD instead.