KHE has a HUGE head tube and the detangler is inside it. most people can't get them to work worth a poop without messing with them a bunch.
that hoffman I mentioned is not bad at all. if will hold up well, if you take care of it. you can learn peg tricks without the axles breaking and learn some good riding skills while not destroying expensive parts. then, once you have some good skills you will have a better idea of what parts/bike will work for you and your style of riding.
and don't worry about the weight of it. it will help you get stronger. do you think the guys in the gym lift light weights to get strong? no, they lift heavy weights.....