There are only two 160 GB hard drives on the market that are compatible with the MacBook that I'm aware of: the Seagate Momentus 5400.3 and the Hitachi 5K160. I've believe the Hitachi is available for about $220 from NewEgg while the Seagate is usually about $280 from most vendors. Be sure you get the SATA version instead of the PATA (or ATA) version...only the SATA version works in the MacBook.