Looking into getting a 15"PB right now w/ a 100GB HDD. Is there a more significant difference that I'm missing from going with the 5400rpm over the 7200rpm? I'll only be doing basic Photoshop work, word-processing, so I'm not going to be very demanding of the system. I just wanted to be sure I wasn't missing out on some technical know-how in making my decision. Whether the speed increase is worthy of another $100 basically. And for those suggesting an iBook instead given my needs, thanks, but I have my eyes on the PB. I'd prefer something as "future-proof" as possible and I just want a PB. Better to have more than you need than to be wanting what you don't have. Thanks. And as for the switch in memory: How much does another stick of 512MB RAM that's tested to be compatible w/ PBs run? I'd prefer to go through NewEgg and with Crucial, but I'm having problems accessing the site for some reason.