Help selecting new board!

Hi guys, just after some advice on another board purchase. Currently am riding a 2012 ronix mana (135cm prob too short ha)... But am not liking the pure flat bottom for landings ( way to harsh on knees ). Although I do like how it holds a nice progressive edge and breaks free on the water and is rather slippery and easy for surface spins. Thinking of either a : byerly blunt. Or the slingshot response as I have heard great reviews, just wondering what you guys think and any other brand you may think of. Im 5,9" and 169 what siZe board do you recommend. Thanks alot!!