MmmMaxtor
I've got the drive you're going to buy - it's very nice.
I'd be cautious about buying a case separately and putting in a harddrive, unless you've already seen the case in action - i bought just a case to house an 80Gb drive, and it is the noisiest most c*$p piece of cheap s#$t you ever saw - even though it was the "better" of the ones available..
So only buy an ext case if someone can recommend a specific one (or you might end up with a lawn mower like i've got! You really appreciate the finish of the maxtors from my experience. Note: i've not used the LaCie's or anything, so i'm not saying they're better or worse. But if the price is good... Hell yeah.)