You have some good , no, great, info to go on from prior posters.
I chose the YHM flip up front and the ARMS 40 rear because I have difficulty with the standard A2 sight in the same plane as my EOT.
The dominator solves the problem differently, see prior postings (option 2).
You have essentially 3 choices:
1) Co witness the front and rear sights in flip up fashion. (eg YHM and ARMS 40)
2) Raise the sights above your Eo thingy. (eg dominator) so they are in the lower 2/3 rds of visual window.
3)Keep the front sight standard (in the same plane) and use a flip sight rear to co -witness (I'm not sure which one, probably Troy or ARMS). The front sight fades out of the visual plane and works very well for younger eyes. Saves changing sight planes visually. not as easy after age 40 or so.
All work. Most choose the front sight standard (option 3) because it is simpler and requires fewer changes. I chose option 1 for several reasons, mostly my older eyes, and it works for me. Other good minds will chime in shortly to comment.
If I were younger, with no age related eye changes, I would probably keep the standard A2 front sight in the same sight plane, and would add the appropriate rear flip up. Lot of choices: GGG, Troy, ARMS, Midland, and whoever else I forgot.
Regards,
Rick
PS google RBPrecision for an excellent discussion on co witnessing.
I spent 15-20 hours on this question as I solved my problem. Hope this helps you!
Good Luck!