Well, I happen to be currently running a setup close to what you want:

6112 front but on 650lb springs (1.3" lift)
Eibach rear shocks on Eibach 1" rear spring.

The Eibach shocks are temporary till I finally get my Bilstein 8100s.

What I bolded in your original post is a set of unrealistic expectations.

If you want to have performance+comfort+longevity, you have to pay up for a Bilstein 8000 level suspension or a tuned Fox setup. That's about 4,000 and you won't really make it to 100k if you actually push the suspension offroad.

So you need to choose what you actually need/want the most.

Bilstein 6112 on standard springs (which are 550 or less, not 600 as vendors tell you) are fantastic in the ride quality department and should last 70-80,000 miles. However, their offroad performance and front dive is nothing to write home about (too much bounce and hits). So you can do 650lb springs, but then expect to pay for the massive offroad improvement with a reduction in road comfort from plush to fine.

There is no more cost-effective option than 6112 for the front but the issue is the rear.

The Eibach rear shock is a fine shock. It is also a 100$ shock so it is unrealistic to expect it to match the performance of the 6112 especially on 650lb springs. Its down travel is mediocre as well. On the other hand, it is a better overall fit for a 1" lift than something like the small Icon 2.0 IFP. But the Icon is better in rock crawling (more down travel at 1" lift). My Icons lasted 10,000 miles--I did use them though. On a couple of occasions I used them too much which is what had them give up.

So the rear is a real issue. You can do 5160 but it has poor reputation for ride and longevity alike. You can do 5100 or Eibach but desert driving and long washboard driving will need to be planned for/reduced in length and/or speed. Your rear seat pax will hate the ride on any 2.0 or smaller shocks on any higher speed rough off pavement section after a few miles. They will all be fine in low range.

Considering the questions you are asking, you will probably do fine to start with 6112 and a simple rear monotube shock.

Since you are in Colorado, it will pay off to trade the plush ride of the 550 springs ("600" nominal in vendor talk) for the much better rock clearance ability of the 650lb springs, CO trails are getting too much use and abuse, becoming harder by the year.

For the rear, I would definitely look to compare the downtravel between 5160, 5100, and Eibach and take the one that offers the most on a 1" lift. Eibach shock only gives you 4" with the 1" spring while Icon 2.0 gives 5+ (but less uptravel because it has a longer body).

In any case, you can forget about the 100,000 mile life on anything that is put to good offroad use though crawling in CO should be a lot more forgiving for the suspension than driving in the AZ desert

EDIT: with all of the above in mind, maybe actually Dobinsons is indeed the best option for the specific CO use. I have had Dobinsons 586lb springs and they were great. Expect a massive initial lift till the springs settle in 70-80 miles or so. Their twin tube setup should be perfectly fine for CO. Just don't expect those shocks to keep up with 6112s on 650lb springs at higher speeds/longer time.