Currently my dex char is 16 with 10 ap's a turn while my gf's wizard has 16 from glass cannon.
Due to her having +3 con on her gear, until around level 12 she actually had more health than I did even with the penalty, because constitution is very powerful.
Tbh on Normal, Glass Cannon is a much better way of getting action points than speed - so you're better off investing in some Con than worrying about points in Speed (of course, you can do both if you fancy, since a dex char really doesn't need more than about 12 dex with bonuses heh).
Lone Wolf for the sake of more action points is a bad idea, because you suffer with less people due to crowd control becoming much more effective when you get 1 person taken out. And on Hard, the health stacking would suck for anyone who doesn't have a source of vitality buffing (like picture of health).