Uneasy-rver I think you plan is sound and reasonable. As a first time buyer you're looking at basic class A's that will get you where you want to go at a reasonable cost. Might not have the ride comfort of a diesel and the added options that make life a bit easier on the road but for a single year you should be OK.
The year range of a few seasons old is also good. The tire should have plenty of life, no major maintenance items coming due and buying used the last owner took care of the post sale warranty items. The house and chassis warranties will probably have expired but you still in the sweet spot of coach age with regards to overall reliability.
Both the Ace and FR3 are fairly popular rigs and shouldn't be too difficult to sell after a year. Plus you can throw in the CRV towing equipment to sweeten the deal. Keep the coach clean inside and out. Maintain a log of everything you do to the coach from fuel fills to oil changes. If you sell it yourself you'll minimize the loss. Take it to a dealer and your costs will escalate quickly. Dealers sell at retail but buy wholesale.