im going to be a first time mac buyer. i don't want to buy a current macpro tower because I know a new model is supposed to come out next year. i really don't want to wait that long though, my current pc is quickly biting the dust. so i am considering buying a 17 inch 2.4-2.6 ghz with 2 gigs of ram and then adding in 2 more gigs myself. and hooking it up to a cinema display on my desk with a keyboard and mouse. i have a couple questions... 1. is installing 2 more gigs of ram myself easy? i want to save money and get them off of crucial.com or a similar website. also is it easy/possible to install a new hard drive? 2. will using a laptop like its a macpro work just as well? is there any drawbacks to this setup? please let me know what you think!