First, you have a great time frame and $ cap, so take your time. Personally I would look at 2-4 year old Foretravels and Newmars. Let someone else spend the first year getting all of the bugs worked out (and they all have gremlins that need to be worked out) and taking the big depreciation hit.
Second, when you narrow it down to a specific manufacturer, start reading the owner's group forum, either here or on some other forum. Great place to get information on the good and bad for a particular manufacturer.
And if you are going to fulltime, make sure you get on the Escapees
forum and read the fulltiming sections and the "Graduating to Fulltime" section - -best information on fulltiming anywhere.