OP - You have started off on the right course. Going out and looking, and kicking tires, walking thru many coaches.
I'd suggest before you spend big funds, and buy a coach that is to serve you in full timing duty - to keep looking until you can develop:
> A list of 'Must Have's' and 'Nice to Have's' of both mechanical (Engine size; side radiator vs rear; tag vs non tag; IFS vs straight beam; Aqua/Hydro Hot or not; etc.) and interior/livability (Number of slides; Driver side only, or not; Kitchen in slide, or not; Interior layout; counter layout; interior storage; material choices and quality of wood working; etc.).
> We put our list of Must Have's/Nice to Have's into a spread sheet, and then each of used this to score various coaches. We awarded a single point if an item was found. And we each had up to 5 items we could choose to award up to 5 points. (So if a large galley was important to one of you, it could be awarded 5 points. Or say if Jake Compression Braking was important to one of you, it could get 5 points.) The scores were then merged together, and this gave us a pretty good impartial/emotional grading of a coach.
>We did this until we game up with a list of Manufactures/Models and model years that we felt best fit our lists of Must Have's and Nice to Have's. This became the list that we then started to do our due diligence on to shop for.
>Do not be afraid to drop years to remain within budget range, to buy the highest quality coach that you can find. Quality lasts. And a quality coach, is a good foundation to build off of or customize into making this soon to be 'home' - your coach.
>Stash aside some budget, to do catch up maintenance when you first buy it, if needed, so that you have a good baseline on where everything is from a maintenance/condition point of view.
>Having a secondary stash of budget to cover any interior modifications that you feel you want to make it your coach. (We made some pretty quick mod's on things that just had to be done now. But, we also waited a full year on some of the more expensive mod's, to be sure we felt we really wanted to do them. Many items changed in that year, from what we thought, to what we actually ended up modifying.
> Due pay for an independent inspection to be used, as mentioned earlier, as part of the negotiation process. Fluid samples analysis included.
I'll stop here, but the mentioning of gas vs DP, and then from a say grade B coach Itasca, to a possibly grade C- coach in the Gulfstream - indicates to me that you both are all over the board
Your money and you can do with it what you want
! But, going slow and steady now on the search process. Could pay grinning dividends via actual enjoyment factor ahead!
All my best to you both on your search,