lol, yeah that brake is rough. The lapbar is down around the stomach too so it could very well knock the wind out of you. I went to IOA today and I remembered this question and thought about it when I went on the rides, so here's how I think they all rank from least intensity to most. (not including the Unicorn)
1. Ice Dragon - this is definatly the least INTENSE coaster of them all IMO. It is very smooth and not quite as relentless on the speed. It also has less inversions I believe. However it is still scary, watch out for the wall. (ride in the front row it's worth it)
2. Hulk - This is a VERY intense coaster, every time I ride it my head is buzzing well after I get off. It is VERY fast too. However it goes so fast that it is not that bad. I mean when you get launched out of the tube you don't really have time to contemplate every g-force. I can imagine it must be terrifying even to look at though for a coasterphobic person.
3. Fire Dragon - this one is about the same as HULK but I think it can be more intense. I usually ride in the back of this one and it whips you around good. For some reason it feels faster than ICE. It flips you around a little more too. You could probably make it less intense than hulk by changing where you sit but I'm not sure on details on that.
A few things to remember, keep your head pressed firmly against the headrest (you won't have a problem with this on hulk b/c your head seems to assume that position automatically as you shoot up the track). This will prevent your head from getting yanked down when the g-forces hit. Also sit on one of the outside seats, you won't get as queasy there if you are prone to have a weak stomach.