Excuse me beforehand, if this is a little long. I'm a complete noob to Mac, only been on one a long time ago, but it's being recommended to me now to dive into the Mac world. Anyway, I'm a little confused about the difference between the 20" and 24". I guess I don't really mean the actual "difference" since I know one has more ram and memory capacity than the other and I'm kinda at a loss at which one would be right for me. I basically only use the computer for your average stuff - internet, photos, some music, but I do play ALOT of the Sims and select few other games. I wouldn't call myself a HUGE gamer, but I do end up with a lot of expansion packs and such when they're available. Basically I'm asking if the 2GB w/ 320GB hard drive or the 4 and 640 is better for me. Also.....assuming I'm told the 4 and 640 is the better option, would it be a better idea to just upgrade that from the 20" where it would still cost $100 less, or take the 24" for $100 more. I hope I didn't make that confusing. Thanks in advance for any responses.