Hand/foot injuries can suffer from long term from sensitivity to cold. Maybe the Polaris smart hand warmers might be an attractive feature, so I'm guessing Polaris.
If your keeping your mountain sled, I'd guess one of the Matryx 137" sleds.
If you are not keeping the mountain sled, I'd guess a switchback 146" because you still can't resist the thought of having a capable deep snow sled.
Either sled you could get to the 2up lock and ride seat attachment if you wanted.
Probably way over analyzing...