Well, you've started in a good place, but be aware, most owners will tout their particular brand and model. Also, most posts you see specific to a brand or model are negative because the owner is experiencing an issue. Almost no one comes onto these forums and posts "I had an awesome day with my RV today".
I think the best advice I've gotten here is to determine your floor plan first and find a coach/trailer that meets those needs. Second best piece of advice is do not buy new first time. IMHO, you have to live with the floor plan in order to figure out if it works. We just bought a cheap old gasser for our first coach and compiled a must have list.
There are brands that have a higher quality of workmanship than others. I will not enumerate those here, but you can tell by just looking at the NADA values which ones they are. You may not be able to afford the best quality rigs, so picking a brand with a reputation for quality becomes an exercise in compromise.
Finally, go to shows. Don't talk to the sales people, but look for signs of quality; fit and finish of the interior, well thought out accessories, high end appliances etc.