You might as well look for hard drives with USB 3.0 ports....  I bought new 1TB WD My Passport with USB 3.0 port from ebay for ~90. It has not been long so I can't say about durability, but the speed is little bit fast than USB 2.0. ( While copying 30 GB files (multiple files) from laptop to hard disk, the speed was ~16Mbps, with USB3.0, it was ~26Mbps), and ofcourse, you need USB 3.0 ports in your laptop too.