ARE MX series with windoors on both sides and/or at least one side window with a vented windoor if you plan on sleeping in the back. I wish i got one side with a screened slider but was too cheap at the time to justify it. its well worth it if you are back there and in bear/cougar country and dont want to sleep with the windoors wide open.
the interior carpet is nice on the roof, prevents most condensation from dripping on you.
this is what the vented windoors look like.
also dont get the compression front boot, i went with that and its terrible. never really seals correctly
i had a snugtop before the ARE and i like the ARE better, the side windoors are an absolute must.