I can't speak to specific brands, but looking for much the same thing in a new bike, here's how I went about it. I wanted a dropper post set up so that at max height, I'm "fit" with the bike in terms of leg extension. At the other end of the spectrum, I wanted as much throw as possible for different geometry options, so I got the longest I could find (13" or so). Based on this, I needed a bike with a frame that 1) had the geometry that would fit me with the post at max height but still allow the post to fully descend, and 2) had a straight enough length of down tube to fit all that throw.
A Specialized Stumpjumper FSR fit this bill for me (wasn't easy to find a full-suspension bike with a straight enough down tube for the full throw of this dropper post, but the geometry is perfect). What I sacrificed for this (until I figure it out) is the ability to mount a solid front rack (mostly because it uses a Maxle, but I'm not sure I'd trade this for "easy" front racks, since I have a rear rack that covers most of what I need, and I love the Maxle).
There's also no seat bag with a dropper post (or I'll bury the bag into the rear tire when I go down), so I use a rear rack. The rear rack in this case does several other critical things:
- Eliminates brake judder (by breaking the harmonics of the seat stay). I don't know if you've heard of this, but the sort of bike I have appears to be very prone to this, and mine had it bad. This totally cured it.
- When I'm in a particularly steep chute, even with my seat all the way down, I may hang back over my rear tire. The rack keeps the crotch of my shorts off the wheel, so I don't have to "float" over it. I don't sit on it, but it's very easy to get my weight as far back as I can without having the rear wheel grab my shorts.
- It works as a rear fender (more to keep gunk from spraying onto the back of the dropper post than on me, but still).
- It obviously lets me carry a bunch of gear in a set of panniers. My tool pouch is a flat, rectangular thing that (not coincidentally) fits perfectly on the top of the rack. This was one of the steps I took in getting away from a backpack (hydration pack eventually went into a handlebar bag and now my back is free, but that's a different story), and I can still drop my seat unhindered.
Other than frame geometry options like this, you're probably looking more at the handlebar style than anything else for alternate riding form (especially getting yourself more upright)?
