If you can, take the factory tours. That told us which manufactures gave us the warm fuzzies, and which didn't. One (I believe it was one of the many Fleetwood brands) was even made in Mexico. We stayed away from that factory! lol
Once you narrow it down to two or three of your favorite manufactures and find some floorplans to your liking,, check out the warranties, and pick one with at least a two year warranty. That says a lot about how much faith that a manufacturer places in their own product.
There are a lot of good ones out there... we've had Coachman, StarCraft, Keystone, Celebrity, and Jayco.
Good luck!