Hello. I am prepared to make the jump to Leopard next Friday and I am very excited. One of the many reasons that I am excited is, of course, due to Time Machine. The problem is that I do not own any external hard drive. So, for the sake of using that feature, as well as making a back up copy of my current hard drive before installing Leopard, any recommendations would be great. I am currently using an iMac Intel Core Duo 20" with a 250 GB hard drive. I have about 100 GB remaining, so any recommendations on an external hard drive that isn't any more than $150 would be great. Thanks!