I just had my 1.6Ghz Powermac G5 stolen from my apt. so I am looking to buy a new computer. I really can not afford a mac pro, so I am going to get a 20in iMac (assuming a 23in doesnt come out on the 12th). I was going to get 1GB of RAM and then but another 1GB stick from crucial or somewhere else maybe later on. How hard is it to change on an Imac. I changed it on my old Powermac but that was simple. I dont know if I should just buy the imac with 2Gb or upgrade it myself. Any suggestions?