So here is my situation: I'd like to upgrade my storage. I'm currently sitting on the stock 160gig drive in the MBP, a 500gig TM drive and a 1TB drive for media and misc, both USB, and thus slow. Both of these drives are about 50% full. I've settled on two possible options: 1) Upgrade my Late 06 17" MBP with a Momentus 7200.4 500gig for (some rough estimate) around AUD$350-400 (they supply the drive), installed by Apple Techie. Warranty will run out in December this year, so it's either I wait until then and do it myself (and get the drive for cheaper) for about AUD$270. 2) Buy a 2-bay eSATA/FW800 OWC Case with a cheap eSATA expresscard for the MBP. This comes to about AUD$280, shipped (without any drives). I've decided to go with the Seagate 1.5TB drives which I can get in Australia for about AUD$205 each. I'll only get one to start off with. Total is about $500 Aussie dollars. Over the long term, ie if I sell my MBP, I will need to part with that 500gigs of storage, and I would be again stuck with slow USB drives to play around with. Whereas if I got the external, I would be chained to my desk if I wanted to boot off it. This isn't a big problem since 99.9% of the time it will be on the desk. But is the external a bit of overkill? I mean, I don't need the whole extra 1.5TB (with the option for 1.5TB more). Plus, the Momentus compares favourably with it's 3.5" cousins. Ideally, I'd like the external, but $500 is a small chunk of change. Please help me make up my mind.