3.23 has been the best for me. I drive a ton and those help a bunch.

On the eastern KY two lanes I don't think you will want a 2.94 or higher gear. I run into enough traffic over there that it would cause some extra shifting as the 3.23 almost does sometimes.

If you are running a stock size tire the 3.23 will turn plenty of RPMs on the interstate. A 3.55 would be getting close to unbearable for me. But if you find a deal on one I wouldn't turn it down, I know parts in our part of the world can be hard to come by and new stuff is spendy.