Seilerbird's advice is spot on. Look at what you think you want plus other options.
We thought we knew what we wanted (Class C less than 25'). Got to show walked through a couple and quickly realized that wouldn't work at all. Then started looking at Class A gas. Considered those and then changed our minds again and realized we need a Class A DP. This was in October 2014. The next show we attended was the 2015 Florida Super Show. We once again quickly walked through a few Class C's and confirmed too small for our needs. Then we walked through just about all Class A DP's. We then took ArdraF's and Gary RVRoamer's advice and really paid attention to what we liked, especially floorplan, but other things too like included features, fireplaces, dishwashers, washer/dryers, bed size, etc, etc. Finally narrowed it down to the Tiffan 33AA and the Forest River 34QS. We then researched and researched. Went to a couple other shows, over to Lazy Days in Tampa and finally in October we bought the FR. So overall the whole process took a year.
Enjoy the search and Good Luck!!!