EXL110W, EXL115W:
http://www.daddario.com/DADProducts.aspx?ID=1&CLASS=AABA
You can get wound singles from Ernie Ball and others down to .018", Musician's Friend has them... generally, you sub heavier going to wound - a wound .018" for a plain .016", a wound .019" or .020" for a .017" plain etc. The wounds aren't as loud, bang for bang. They do tend to hang up in the nut, until you've fixed it. I always keep at least one guitar with a wound third around, for those times when I really, really want to stay in tune.