Recently gave up the waiting game and purchased a macbook. should arrive tomorrow. now its time to purchase all the extras. i have been looking at a 500GB LaCie Drive (7200 RPM) with USB, eSATA, and Firewire 400 connectivity for $130. Today, however I went in to Office Depot and a sales associate said I should go for 750 GB...I was skeptical...thoughts? (my Macbook HD will be 250GB). Also there was an unlimited online backup option for $80. I'm wondering if anyone has had any experience with or can shed any light on online back up? which of the two options would be best? Thanks.