I, about the same size, have also been thinking about a 165 for a potential diy split bc pow board. Last year used an Option 162 northshore (shovel nose pintail) on a couple of 18-24" dumps...worked great and no complaints but seemed perhaps just a tad short (meaning I found myself wanting more float and to go faster) on the less than steep lines.
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Keep in mind if you are going to be doing the backcountry thing this year you are going to eventually want a split. The Colorado snowpack just doesn't work great for snowshoes once you get away from well worn trails. The Arbor would make a fine split. Everyone freaks out about ripping their board in half. From what I understand it has little effect on the boards performance. At least according to Monk of down the middle. So besides the cringe factor, just do it.
That deck would also make a good slackcountry stick. Hitting East Vail, the 40 gate, Fish Creek, the stuff out of the Loveland gates, etc.