So I understand that you said not to say its about the play style, but it is. That being said, for your playstyle of killing but not being killed, i definitely recommend a heavier class, particularly Guardian or Warden. both have amazing survivability, and those Warden "minor" self heals you talk about are actually not so minor when you get to later levels. I have a warden and can pretty much solo and landscape fellowship quest. I've found that when the Warden is played right, its basically unkillable.
Then again, warden isn't for everyone and also the upcoming class changes will really change just about every class, but i can still confidently say you want a Warden, Guardian, Champ, or Captain for survivability and not being killed.
Zacharr -- 100 -- Hunter -- Firefoot. I guess that's the new character signature :P