my .02 would be to demo a newer Rockstar. Any of the 2013 and up are a vastly improved design. can maybe get a 2015 used, still a sick boat.everyone I know with 2015 rockstars' love the performance. downriver as well as playing.
sorry to say but ,imo 2012 was a subpar design. or at least they massively improved upon it, and rounded them out for all around use.
I demo'ed one back in 2012 and it felt drastically diiferent then any other Jk i had paddled, and not in a good way. from my understanding it was specifically a park and play, competition Hole boat.
That being said, i am a timid playboater, no expert by any means. My boat of choice is a 2012 Superstar. I love my boat. i think its a pretty classic design.
if you want a downriver playboat the 2010>up Star series, (allstar, not Rock star) is a great choice, if you can find one.
if JK outfitting didnt work for me, (knee position has changed in new designs, karma and Rockstar L dont fit me right... zen and superstar do...)
Jed would be my next choice for playboat.