Timbersled SX 137 with TSS. Single skis are the way to go.
I got a chance a couple years back to ride a Husaberg 570 with a 121 Timbersled. After owning a Snowhawk for a few years I found the Timbersled a bit more agile at lower speeds and easy to rip lines on steep terrain. I did however miss the horsepower of the Hawk (not the weight). Wish I could put a Timber and a Pro in the garage!