So here's the thing: What would be the (noticable?) difference in performance of the 2Ghz MBP between these specs? 2x512MB of memory & 100GB (7200rpm) hard drive 1x1GB of memory & 100GB (5400rpm) hard drive The two work out the same price, you see. I don't think it likely that I will want to up the amount of RAM in future, so how noticable would the speedier hard drive be? The Assscat.