I'm sure there are folks that can help with the manufacturers to stay away from, but from my experience of manufacturers/models TO get, I would Google your requirements to come up with a list that interests you. Then you can narrow down by reading reviews and product construction info. Look for LOTS of reviews... and interpret them... I've read a lot of reviews that owner's don't understand how new RVs can have so much wrong with them and look at the issues: structure major wiring or plumbing issues could be a bad sign. Also, check BBB for manufaturer, models, and dealers.
Then, you can search the model(s) you like to find price points and great deals. Also, either new or used, do a thorough inspection. Looking inside cupboards, walls, behind, under things, fit and finish inside and out, plumbing, electrical.
I've just completed reasearch and bought a new (used) MH, and while doing research found many complaint on the regular shakedown stuff, one owner bought a used unit, had front end alignment issues, and tried to go after manufacturer.
Anyhoo, hope this helps.
Cheers, Ron