I've never done partitions, I really don't see the point. Though I'm sure you can move documents around like you do in Vista (right click properties). As for game save manager, I backed up everything with this http://gsm.duncsweb.com/. Though I also backed up my whole documents and most game saves are stored there anyway. If you're keeping your documents on a separate partition, I don't think you'll really need it.

Also, don't forget you can get 7 for £30 for being a student, you just need a .ac.uk email. One thing I forgot to backup was my FRAPs folder, I lost over a thousand screenshots over the past few years, which was annoying.