I've got a 13" and its great to carry round etc. Light gaming is also pretty good on it. Mine has 4GB of RAM, which I would suggest if your going to be doing programming, mulittasking or gaming.
-Peace!
-Peace!
Applecare will only extend to 3 years from the purchase date of your Mac, not the purchase date of Applecare.
The ONLY thing that may be on the 'iffy' side with using the 13" for what you want may be gaming. Although you did say that graphics were not overly important, in which case you can just turn down the settings a bit and I'm sure you will have no problem.
OK next question would you recommend the AppleCare Protection Plan? Is it really necessary?