Originally Posted by adamrice

If you're set on a Trek, maybe split the difference with the 520 Grando. The thing about the 520 that gives me pause is that it has disc brakes with QR dropouts, which are less and less common. Set aside the discussion of whether you really need through-axles on disc-brake wheels, that's where the industry has gone. Also look at the Checkpoint.

A custom build is satisfying because you get exactly what you want, but it is disproportionately expensive.

If you're not limited to Trek, you've got scads of options. Gravel is the hottest category in cycling right now, and is a broad category ranging from "almost road" to "almost MTB." The Cannondale Topstone might be out of your price range but looks really interesting and is favorably reviewed.