Kind of shitty advice ... but all 3 would work well. If you like bombing or real big features the Evo may be a bit soft, but can handle it if you can. I rode the Evo at Breck and Loveland (I'm 145, board was 152). Imperial and the blackies weren't open yet (shitty season) so I didn't get to test.
But racing my friends the board started to flap a little. Even under Chair 8 with the runs with all the dunes (I think it was Chair 8).
I'd lean Proto/SL. With 40% park and trees, probably a Proto. If you go SL the 151 was enough board for me (also rode that, but I sucked then, not that I'm good now but I'm better).