I plan to go with the 32 spline axle shafts. I would have to disagree with you regarding price, the PR80 is still more, by almost $1,000 according to my super duper experienced google fu internet research. Also, you gain a lot more with the XD60, such as more ground clearance, more up travel and less weight. The PR80 is really great, but WAY TOO MUCH overkill for the 37 inch tires, in my opinion.
This times two. Thank you.
My driving will mostly be desert and the thought of getting stuck way out there broken down is a bit scary. Better to have something and not need than to need and not have it.
I hope to reach this achievement in life:
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Just kidding, I am the happiest married father in the world.