To see a decent selection, go to this page
http://www.towerhobbies.com/listings/cat-cat-a.html
Click the links for:
R/C Airplane Kits - Trainers .0-.19
R/C Airplane Kits - Trainers .20-.50
R/C Airplane Kits - Trainers .51 & Up
Pretty much any of them would be good. Like one of the others who replied, I have built the Great Planes PT-60. It's a straight forward build. The manual is really good and you can download and study it before buying anything.