The Entegra line is good line of coaches, and agree to check the owners section on specific questions related to Entegra's.
42' or larger? Depends on if you feel the 42' is too small
I like the 42-43' size more than the 40' or 45' coaches.
40' DP's with Tags, you loose 1/2 of the third bay, ending up in most coaches with 2 1/2 bays of storage.
45' requires Class A Non Commercial Drivers License in many states, can be a PITA to not only get, but to also go in for your regular eye certification (at least in California, admit I don't know if this so in all states).
42-43' usually gets you back the full 3 bays of storage.
On any coach from 40-45' in length, I would recommend tags. And I would do the math on the 'Power to Weight Ratio'. Some of the heavier mid to mid plus level coaches, are sent out with the Cummins ISL. These can be bordering on underpowered in some coaches. Get the vehicle weight and do the math. Maybe not so much in today's, but quite often a bigger engine can yield the same or better MPG then an engine that is just a bit underpowered - the big ones can loaf along at highway speed. And of course, for hill climbing of serious pulling (if needed) the BIG BLOCKS provide you with the HP and Torque to get the job done.
I also must admit, that I don't recall what engine that Entegra model comes with, and if larger engines are an option.
Best of luck on your search,