It's unfortunate that the Trail with KDSS isn't easily available everywhere. I have probably 10 within 30 minutes of me that I can go test drive. In the West we get a lot of them. For me - KDSS was a must have, but not strictly for offroad use. It was so much better for street driving that I opted for a trail premium over a limited. I have a landcruiser as a dedicated trail rig, so for me I wanted a good daily driver that's also capable of long distance mild offroading, and the highway manners of KDSS sold me on the trail edition. Some people don't think KDSS makes that much difference. I drive a lot of windy canyon roads, simply due to where I live, and the sr5 and limited with xreas both felt too soft and floaty in stock form. Basically just like the feel of a tahoe or suburban. If you like the ride of those, the SR5 or TRD Pro should be just fine.
Otherwise I probably would have gone for a limited and aftermarket suspension, then added air lockers.
I know you said you didn't want to modify, but just food for thought. A trail edition is pretty good stock. If you drive for a while and decide you want to go with more front suspension dampening/travel, a set of aftermarket FOX 2.5" remote reservoir coilovers is about $1500 and another 200ish to have a shop install them. The rears are $260 and maybe another $100 if you have a shop install them. With that change you should have equal or better offroad performance than the TRD Pro - and the Fox coilovers are adjustable height - so you can just buy some $20 spanner wrenches and adjust up or down from 0-3" of lift. You'd be right in the same price range as a TRD Pro, but also have KDSS. And the upgrade is optional if you decide you want it.
One final thought here - take a look around for a GX460. They should be easy to find if you have a Lexus dealer to take a test drive. They all have KDSS and are the same chassis as the 4runner. That would give you a feel for how KDSS handles.
Good Luck.