Everyone tells you to look for a layout you like first - They're wrong!
Look at the quality of construction first. How its made, what it's made form, how its put together, is the frame strong enough, are the axles strong enough, is the roof constructed well, how thick is the floor, etc., etc., etc. Pull out drawers and look behind them, open cupboards and stick your head inside and look up, open cubby holes and stick your head in. Get down on the ground and crawl underneath and see what how the frame, axles, etc. are put together.
Don't be afraid to get your blue jeans dirty. Forget about the floorplan, figure out what is a well-made brand and what is a piece of junk. Once you figure out what you are getting for your money, then it's time to figure out whether they have a floorplan works for you. Best floorpplan in the world won't be worth squat on a bent frame.
Take your time, I shopped for over a year before I bought. Quality is the number one Beef on this site. Why would anyone recommend you buy a floorplan instead of buying quality? You can still buy entry level if that's what you want or can afford. But at least know the quality of the entry level you are buying as compared to other similarly priced units. Only you can determine that. No one else can do your homework for you.