My thought was with a 300gb drive and a new 128gb ssd, a 500gb backup would be enough. I guess what I'm planning to do right now is leave the hdd in tact and run as my non-boot drive. I'm going to install windows 7 on my ssd and BF3 and the new Star Wars MMO on there if it's ever released as well. At some point I suppose if my ssd seems stable, I'll delete windows vista off of my hdd.
I wish I knew when my passport just copied over the in the 139.41gb of the 230gb or so that is actually on my hdd. I guess I'll have to browse manually when it's done copying.