Any of those 4t bikes will be fine, but a 300 2t will be better for tech terrain and will also be great with a sled conversion. The serious moto / sled people in my circle say that the idea of converting to a sled and back is attractive but the reality is not. It's a lot of work, and the sled use is brutal on the motor with tons of WOT time, so rebuilds are frequent. 2t rebuilds are WAY less $, and the newer injected ones don't require any jetting or BS when going to altitude or in different temps. Whether your can plate one depends on your state laws.
Any of the motos you listed will have more than double the power, better suspension, and 50-75# less weight than your WRR, but they will require a lot more maintenance. Honestly, they are all so good that you can pick your color and he a dick about it.
I'd get a KTM/Husky 300 or Beta 500 personally.
ride bikes, climb, ski, travel, cook, work to fund former, repeat.
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