Pandi, You are asking a very open ended question. There are many good used diesels out there but finding one is a process. The most important thing in my opinion is to find a floor plan you both like.
Beyond that factors concerning looks, upkeep, miles, condition of the coach and of course price are important. It seems as though you have a pretty nice coach to start with and after some time on the road you will get a chance to see and talk with some coach owners to help with a decision about a diesel. PPL and Motorhome Specialist are two sites to look at coaches on line. Best to you and safe travels. Arnold