Make sure you buy from a reputable preferably close by dealer. So many people have problems getting work done when they buy out of town. Many dealers (who I consider stupid) turn away warranty work on rigs they did not sell. Especially if you buy from a big volume dealer 100-200 miles away. They think that they can encourage you to buy local next time.
Actually, I would look at the quality of the dealer before the RV. Even the best RVs have problems, but if you have a dealer who will not step up to the plate, you will likely be out a lot of time and money. Once you have the appropriate dealer(s) identified, then is when you compare the quality of the units available through them.