Almost all makers are having quality issues today. Jayco and Northwood may be the exception. This means that there will be problems with anything you buy, especially new. And that means you've got to inspect any potential unit very, very carefully.
There's also no such thing as 'entry level' in my opinion, only more capable or less capable. There's also just so many things anyone can design into a 5er, although some have gotten really creative, so there's not a whole lot of different floor plans. First you need to figure out a size and floor plan you like - there will probably be several that make them. Then you've got to look at carrying capacities, and holding and fresh tank sizes. So called 'ultra light' units scrimp on these and that means you can't camp without hookups for long. 5ers all have much more storage than bumper pulls, but some models cut that back or don't have enough carrying capacity for you to put anything in it.
Everyone seems to be making dark, grey or tan colored units today. That means you'll probably need a second AC as these get a lot hotter if you settle on one of them. Don't expect much insulation or cold weather capability either no matter what marketing verbiage is attached.