i only run the stock ngk. I have tried other plug types and brands and the car would not run for me. Others have had more luck though, but I don't drive like its a subcompact econobox.

The belt on the 2010 (09+ actually) is "good" for 100k miles. I wouldn't worry about that yet unless you are concerned about the year age of the belt.

the things to look for a general car stuff, ALL the bushings for the suspension need to be watched, but nothing is really like an every aveo needs this replaced.