Looking for input on how much memory is worthwhile on PowerBook w/ 1.5 GHz G4. Family debate is whether to just add 1G for total of 1.25G or buy two 1G modules and go to 2G. If the extra .7G won't mean much, not worth it from my pov. Hoping to keep this around for another 12-18 months and upgrade to Leopard as well.