You are safe with DragonBall Z and GT.. Dragonball itself had some questionable moments.
I suggest Rurouni Kenshin. Was one of my favorite shows when I was about that age
Some others..
Scryed
Fullmetal Alchemist
Naruto
Trigun
and basically anything airing on TV right now.
Honestly though.. He probably wont want to read subtitles and most anime with cleavage or extreme violence isn't dubbed or has such a terrible dub it will make him turn it off

imo let him be free to find what he likes =/