I was wondering between several elites. Either a used synergy or the new gt500 or z28? if its of the new ones, which cams should i get? what are the differences between them? is one more for speed or forgiving? thanks for all the help.

Next to new Elite GT500 29.5"draw 70lbs Comes with trophy taker F/C rest Posten 10" Stabilizer with weights Red and Black Stage One Strings and tune job Applejack Side plates from Git-A-Grip also have stock grips Bow may have 50 shots on the strings Asking $800tyd paypal or money order will...