The resorts I go to are typically Keystone, Breckenridge, and Vail. I prefer powder, but there wasn't much of it last year. I'm hoping for more pow this year and that's what I prefer to ride, but want something good for pow and groomers...basically all-mountain right?
No... all-mountain stands for "all-mountain freestyle" (unfortunate that it is so ambiguous)... what you are describe is freeriding (groomers and pow). I have owned the Evo, the SL and now the Proto.
I'm one of those people who do "belly dragging carves on an SL
" that BigmountainVMD is referring to... but I ride the SL 155 in the park
If you are going to keep your Evo, I would go for the Heritage over the SL... I haven't ridden the Premier, but at your ability level I worry it might be too much board for you (too stiff for you).