You can approach this from multiple viewpoints:
1) Pick your budget range and drop years to remain within budget and buy the highest quality DP that fits your needs. Then over the years maintain it, and upgrade and refresh the interior to your needs. I always consider a higher end older model DP to a 'strong foundation to build upon'.
2) If you feel you'd like to go use a coach for 5 - 10 years, then get out from under and purchase a newer coach in the future. Then perhaps purchase a middle of the road level DP and go out and use it basically as is. Sure maintain it, maybe update the TV's, but don't get too carried away on interior makeover as it is a planned coach to let go in the future. The when the time comes, go shopping per the #1's guidance.
Some mid level coaches that are great bangs for the bucks include:
-Winnebago Journey/Meridian/Ultimate Freedom
-Fleetwood Discovery/Expedition/Providence - maybe add in Revolution
-Rexhall Rose Air (On Spartan Mountain Master chassis, usually with ISC some have ISL. Rexhall builds one of the safest coaches on the highways, with all steel cage construction.)
-Newmar Dutch Star or even an older Mountain Aire (Which in many years I consider on the bottom side of the upper end coaches.)
-Country Coach Inspire or Tribute. Allure is like the Mountain Aire in that in some years it crosses over into the bottom side of the upper end coaches.
-National Almost any of their DP's. Islander/Tropical, etc.
-Monaco - Diplomat/Windsor (So many years with so many models, in some years Monaco had other coaches that would fit into the mid level quality coaches.)
Wound encourage shopping for side radiators (Though some of the models listed are rear radiator.), and mid size ISC/ISL or C7/C9 size engines. The ISB will get the job done in many of the coaches it comes in. But the midsize block engines will do things a bit easier for you.
And repeat that that is not a complete listing of middle level quality coaches. And nothing wrong if a good price higher end coaches, even and older one, comes up as a good deal on grabbing that. My point was pick a budget range a bit lower, if going with #2 - knowing it will be a coach replaced in the future. Another benefit is that older coaches have lower purchase points, and also lower slope on the depreciation curve ahead. That being said, good chance you'll lose 35-50% of purchase price of an older unit, with another 5-10 years of aging.
Best of luck to you,
07 Country Coach Magna Rembrandt 45' ISX600
Roo II was our 04 Country Coach Allure 40'
OnDRoad for The JRNY! Enjoy life...