SRM, what exactly are you wanting to do with this thing? If you want a rifle that will do "everything", you either have to hang 40 pounds of crap off it or nothing at all. All that rail real estate is there to give you options, so you can configure the rifle for your needs.
If you want to stake your life on this rifle, I would go for the flip up irons and reflex sight. I run an EOTech/BUIS combo on my AR, and I love it. Then practice practice practice with both the irons and the optics.
If you want to take down gophers, coyotes, and paper targets, maybe the magnified optic is the best choice for you, and you can leave the BUIS.
Until somebody starts making a magnified optic that tickles your fancy AND has a long eye relief, it sounds like you're out of luck there if you really have your heart set on BUIS.
As a last minute thought, if you put a magnified optic using a quick release mount, you can still take it off and get "minute of bad guy" accuracy at close ranges by using a proper and well practiced cheek weld (nose touching the charging handle!) and the front sight post.
If you want to stake your life on this rifle, I would go for the flip up irons and reflex sight. I run an EOTech/BUIS combo on my AR, and I love it. Then practice practice practice with both the irons and the optics.
If you want to take down gophers, coyotes, and paper targets, maybe the magnified optic is the best choice for you, and you can leave the BUIS.
Until somebody starts making a magnified optic that tickles your fancy AND has a long eye relief, it sounds like you're out of luck there if you really have your heart set on BUIS.
As a last minute thought, if you put a magnified optic using a quick release mount, you can still take it off and get "minute of bad guy" accuracy at close ranges by using a proper and well practiced cheek weld (nose touching the charging handle!) and the front sight post.