clubmac drives are inexpensive and have good chipsets, also check macsales.com they have a good inexpensive line of external drives. Most economical would be to simply buy an enclosure from newegg.com or wherever else and buy a seperate hard drive of any size and assemble it yourself. Retailers/Manufacturers tend to overcharge for external drives because they are preassembled, and they have to buy the drives they use from another company. All they are is a simple circiut board and a maxtor or seagate drive, when you'd be better off doing some research and selecting your own.