I haven't ridden the Berzerker, but have flexed it in a store, and there isn't that much difference between that and your SL. Why not step all the way up and get a Highlife? You open to GNU? A Billy Goat would be sick for your bomber board.
The Berzerker is so similar to your current deck. I guess it will ride a lot different however with camber through your bindings.
Last thought, if you are planning on taking as many trips as you say, why not wait and demo. I've had buyers remorse once, and lost $250 on the sell. Ride is readily available through demo programs.
Haha, I started this post out with the Billy Goat as one of my options. The Highlife is an option, its just wider and my understanding that besides the popwalls vs pop rods they were very similar and with the Bezerker being narrower it might fit to my feet better.
As far as demos the last few times I was at baker, the seattle shops were limited on stuff around the 158-160 size for what I was wanting to try. Granted I usually take my trips around feb-march, so stock is usually lower then.