Darth Lefty 

All the things being recommended are cultivars of road bikes (curly handlebars, no suspension). Have you used, or do you think you will like, drop bars? Are you ok going without the suspension fork on your Trek DS? I wouldn't suggest you worry about subtle differences in frame angles between models unless you already have a road bike and have some idea what you'd like to be different. Every kind of road bike can be comfortable for a long ride. It depends on your condition, really. People doing 200 miles a week tend to want an Ultegra level road racing bike.

If this will be your only bike and you might be using your bike for commuting and overnights off pavement, then a gravel bike is great. Any brand will do... I like Salsa and they just introduced a revised aluminum model called Journeyer that looks pretty great at higher spec. With your stated preference for components you probably want a bike with GRX 400/Tiagra, or Apex 1. Be honest, though, about your use. If you are keeping the Trek, it covers the camping and dirt road stuff. A lighter bike with slicks will be best on pavement and RAGBRAI.