I will never get rid of my stockers, one of the best looking oem wheels! And always good to have a spare set just in case especially if you going to get dirty
The 8.5 wheels will stick out .33 inches more than stock and the 10.5 will stick out 1" more than stock, I personally don't like staggered wheels on our trucks for looks and when it comes to tire rotation you are limited to get the most tire wear. I say go 10.5 all around you could even go with a lower offset becuase you are still not close to being aligned with the fenders