Well if you're going new I'd get a Polaris pro rmk/assault or a 2013 summit xm, my dad has a 12 pro and it's a dream to ride. I'm buying a summit xm this week. I'm a doo guy but those pros are beautiful rides I would be fine if my new doo handled the same way. It's the etec power plant that...
I'd stick with with the summit and hold out for the assault! Suby said it right a mountain sled makes a better trail sled than a trail sled makes a mountain sled. If you get the switchback let us all know how it is!!
You buy a nytro for 12k you need to invest 4k for a turbo right out of the gate to even mildy compete with an 800 smoker(you'd still be disappointed the bush) or you buy a Doo/poo for 12 k and have to rebuild it every three years (doubtful). So by simple math that 4 grand you saved on a turbo...