Specialized and Trek are two of the biggest bike brands in the USA, and Jamis is one of the 2nd tier brands (in size, not quality). be hard to go wrong with any of them

I'm not a fan of disk brakes on low end bikes, nor suspension forks (didn't look to see if any of these have either of those features). both are awesome features on $$$$ mountain bikes, but the cheap stuff is pretty bad.

if you're a bigger person, a 700c wheel will be much nicer on the roads than a 26". for that 30% crushed gravel and dirt trail, you certainly want a bike with a wider tire, like a 700x38 rather than a 700x28, although I do a fair amount of easy hard pack on 700x32 tires. again, I've not looked up those 3 specific bikes to see where they are on the wheel sizes.