I waited until 67 for my first.
The diesel gen. was not an option when I bought mine. If you are going to be doing a lot of boon docking diesel might be a better choice as it gets its fuel from the chassis fuel tank. I do very little and have not used my generator hardly at all. The LP gen is relatively quiet, but I don't know about the diesel.
I opted for the Fantastic fan in the dining area and later added remote control to it. The fan is a big plus.
The swivel cab seats are another. The passenger side gets used most.
Backup camera for sure.
5.1 sound system.
We have the dinette because DW likes to sit there and look out the side window. I think I would have preferred reclines, but keep in mind you sacrifice a lot of storage space with sofa or recliner.
I also have the Magnadyne radio with Nav. which I really like, contrary to many on this forum.
The stabilizers are also a must for me. DW is very sensitive to motion when parked and the stabilizers do help. They do hang down a bit and require caution when entering steep driveways or dips. I approach diagonally and then they don't drag.
Arctic pack to keep waste tanks from freezing.
Second TV in the rear bedroom. I have found that I can relax on the bed and watch the main TV that is mounted above the cab.
Gas oven, but wish we had opted for the convection oven and used the oven space for drawers.
Hope this give you some ideas. We all have different thoughts on things, so pick what is best for you.
2014 Solera 24R