so are you guys saying it's better to keep it and upgrade the RAM/AppleCare? I know sometimes selling can be a hassle. I think that SD-slot would be great for me, not having to look around for my adapter and such.
I was slightly confused by alphaod's post but I think he was getting at the fact that the majority like to keep their machines for longer as it gives them greater stability.
I think, dwd, that if you are about to buy AppleCare, you may as well take the plunge and go for the newer system. It's not always a bed of roses selling/buying a system, and I lost $450 on the MR Marketplace to a compulsive liar called Cybergypsy aka Sandy Gambino, who I trusted because of her great feedback.
But since I have sold a MB Air to a Bulgarian in a transaction that was very pleasant, despite it's own share of hitches, because we were both honest guys, who were not out to scam one another, and we made sure of it. I scanned and sent him my degree certificates and passport etc and he did something along similar lines. Those buyers who refuse to give such information out may well be a scammer avoided.
As you say, selling is a hassle, but you get a new toy out of it. There are some people who always want the latest gadget and go through 4-5 new laptops a year on this site, so don't feel bad to do it once in a while yourself.