Ron gives good advice. Everyone has a different opinion of what is best for their particular family. Take your time. Visit many dealers and manufactures web sites. Get an idea of what fits you and your family. Then narrow down your search to what brand or manufacture you want to go with.
Remember, sales people are there to sell and all will tell you they have the best and promise you anything.
When you start to purchase determine what your walk away number is and stick to it. On a new unit never start your negotiations any higher than 30% off MSRP. Get the dealer to throw in as much as you can, dump hose, water hose, electric line, weight distribution hitch, tow mirrors. Push for what you can get.
You can expect depreciation to be high.