I presently using a ibook G4. I want a 24" imac. Was looking at the 2.66 GHZ and 2.93 GHZ. I use it for just home use. Uses are Searching net, no games, several programs, financial, word etc., iphotos, and itunes. I just want it faster. Then I started to read and have started to look at last years model 2.8ghz. If I get the 2.8ghz would add more ram to be 4 gb. Cosmetically these are all the same? Help me with which way to go. Thank you