I know exactly how you feel, so many options but I think I got lucky. With My gen 5 19 oem polymer sights, my accuracy has been so good and the poa/poi was just right for me that I was very hesitant to change them so I wanted to get something as close to the stock oem sights as possible from a dimension perspective. I ended up getting the ameriglo orange .125 http://www.opticsplanet.com/ameriglo...ont-sight.html, and then found the rear sights that were as close as I could find to then oem and got these. http://www.opticsplanet.com/ameriglo...ear-sight.html
Went to the range today to try em and they were perfect for me, same poa/poi. By the way the poa/poi for me is more of what sig would call the "combat" hold where the center of the front post is right over the target, not the top edge of the front post that some may prefer. Used to sigs so this is perfect for me. I have the .140 ameriglo on my 26 and while it works, I think I now prefer the slightly thinner .125.