hi..I've finally decided not to wait any longer for the new intel ibooks...also i dont wish to risk my first mac to have problems like the ones in the macbook pro....so i'm certain i want an 12" powerbook now....i'll be using it for grad school at univ...i was thinking of upgrading its 512 MB ram to atleast another 256 MB RAM...But feel thats a little out of my budget even if i buy from a reseller with rebates....However if i get the usual config i do save atleast $150...so i want to know whether the extra ram will make any significant difference...considering the new ibooks due soon and i mite want to buy those later should i upgrade the ram?.....also how good is refurb?...if I get the 512MB config refurb i'll be saving $300....also i want to know abt the software with refurb....in the apple store website it says it may not have some software and also shows a different version of softwares like ilife 05 and not 06.....r there any major differences between the 2 versions?..wat should i do?