I'm looking for advice on getting an optical drive. Actually, 4 optical drives. I won't be burning anything with them, only reading DVD's. They also don't need to be fast. (8X read is the fastest I'll need but 4X would be fine). I'm not looking to break the bank. They need to be: Usb powered, with preferably ONE usb port. SLOT loading, NOT top loading. Again, I won't be writing disks, only READING them. Does anyone have any suggestions on a cheap optical drive model that fits all these descriptions? Please help me find a model number and where to buy it!! Thanks!