Sounds like you have ordered a truck that will work for you! I was thinking about the 3.73 versus 4.10 discussion today while doing some mountain driving.
I wish mine had 4.10 gears....especilly with the 35" tires. If I was buying another one today, it would have 4.10s. After driving mine for nearly 13,000 miles, I wish it had them instead of 3.73s. I believe the 4.10s would reduce the hunting issue mine had on hills when new.
Since installing the taller tires, the hunting has mostly gone away. It seems to stay in a lower gear longer due to taller overall ratio from the tall tires. Conversely, I think the trans would stay in a higher gear longer with the 4.10s. Different effect than the taller tires, but similar results in that I believe the hunting would be greatly reduced.
I think you will really like that power train! Can't wait to see some pictures!