Lance is at the top of my list right now, especially their 2375, which may be a little longer than you want. Lance trailers don't have very large holding tanks though. I've watched several Youtube videos of their factory in action and am impressed.
I also like that Imagine 2150 layout, and saw a very nice one at a recent show. It was very clean, and appeared to be well put together. It's hard to tell sometimes though. It's the only one on this list that doesn't have a dual pane window option or the frameless windows.
The Northwood products already have a loyal following and are nice. The Outdoors RVs likewise. I like them, but they're generally heavier than I am willing to go. No problem for you though.
That Highland Ridge LT216RBS you mentioned is also on my list. It's a lot of trailer in a short package.