your what - 5'10" 150 correct?
and you'll be using them in AK?
190.
If you plan on skiing them as more of an everyday ski - 183.
They ski short because the twin is fucking huge on the tail. The 183 is extremely easy to manage in tight spots. They are fairly stable, though.
I ski the 183 as a touring ski. If I was skiing inbounds or out of a heli, and were skiing the gots, I would go with the 190.
So, I guess it depends on how you plan to use the ski. If you plan to use it inbounds, the 183 will be more manageable but still sick. You only weight 150 so float really shouldn't be a problem.
If you just want a ski for going really fast in tons of pow, the 190 would be sick.
If you want you can mess with the mounting point, too. You could mount the 190 more foward to make it easier in tight spots.
Also - make sure to get this years gots, not next years. They increased the skis sidecut next year and that is just stupid.
hope that helped.