so ive decided to get a stumpjumper. but im not too sure which model to get. im on somewhat of a tight budget but i dont mind spending a little extra for better stuff. i was sort of torn between getting the elite model and a model with the brain. can anyone sway me in either way. argue for or against the brain? is it better on the pro model compared to the expert. or is it even possible to put a brain on an elite frame? my main concern is to get a brain or not. is it worth the extra X amount of dollars to step it up?