If I had to choose from the 3, I would go for the Jammin. Digital servos and upgrades make it tempting. does it have big bores? is the motor a jpx.21? if it is, how much fuel has been ran thru? was it broken in right? just things to think about when buying used. just make sure to inspect it very thoroughly for any wear or problem areas. Hyper 8's are great too.good luck