I love the look of the new SRX but I ride in the UP of Michigan where the snow is mostly Lake Effect which is very sugar like. The one inch track with studs would be useless to me. I would install the 1.5 Storm track which performs wonderful on a SW in those parts. Then I would choose the SLP Mohawk skis, the RR shafts in the rear skid, a taller windshield and maybe some clutching upgrades. There are a few options out there for clutching on a stocker, whether it's Ulmer, a Dalton kit, STM's, Fett Brothers , Thunder Products to name a few. Which one is best is a good question. It seems I am hearing more feedback of people with tunes on these than I am for stock setups.
I don't think I would do a tune the first year, I'd rather see how it performs for a season and then go from there. These things are faster than any stock sled out there. If you get beat it is a good chance it's going to be another SW or TCat with more done to it. There is no 850 Doo or Poo that will stand a chance. No more wondering about that scenario.