I have the 120gb hard drive with 1gb of memory version with xp. I wanna do some upgrading because the computer is a little slow. I realize it is just a 1.6ghz processor but would like improvements if they are worth the money. Would I see a [b]SIGNIFICANT[/b] difference in performance if I upgraded the stock hard drive to a wd velociraptor 2.5" sata 3.0gb/s @ 10,000 rpm and maxed the memory out to 1.5gb (only a 512MB upgrade from where I am at now)? If I only did one of those upgrades which would make give the most impact? thanks for taking the time to read and answer this!