If you don't like Fighters you could play an Abjurer Wizard, they can be
very tanky, especially at higher levels. Trust me on that. If you wanted to be ridiculous you could even pick up a level of Fighter (or go Multiclass Fighter 11/Abjurer) and run around in plate, you don't *need* the strength to use it. You will likely end up with the best AC in the game (due to shield spell, which recharges your arcane ward), and probably the most "Effective" HP due your arcane ward. At level 14, spells won't dent you much, you have lots of utility with ritual casting, and you have a familiar which will annoy the hell out of your DM.