Matawan is on the NJ Transit North Jersey Coast line, so any of the towns on that line would be good to check out.
To keep your NYC-commute reasonable, I'd look at Woodbridge, Avenel, and Rahway. I am not that familiar with Woodbridge/Avenel (from what I have seen they look nice) but I know you can find a place within easy walking distance to the train station in Rahway.
There are quite a few single-family homes in Rahway, plus a lot of new development that's going on downtown right near the train station:
Homes by Maplewood (http://www.homesbymaplewood.com/rahway-projects.aspx - broken link)
Park Square Online
River Place at Rahway (http://www.riverplacerahway.com/index.asp - broken link)
Diversified Communities
Welcome to Carriage City Plaza in Rahway, NJ
Good luck in your search!