There are a number of options, but of those I've tried, I like the
HiViz fiber optics best, as the FO is somewhat protected.
SDM makes a nice bright FO, but the FO is unprotected, and I
have broken an unprotected (not SDM) FO on several occasions.
On sights with an unprotected FO, the FO itself is easily replaced in minutes if it breaks, whereas the entire HiViz sight would need to be replaced in the unlikely event it breaks. Having had both types, I prefer not having to deal with a broken FO in the first place, so I think the HiViz is the better route.
You can have your cake and it it, too, though, if you have a gunsmith install a
Weigand interchangeable sight base. Once installed, you can swap sights (including a HiViz) in seconds if it breaks and/or you prefer a different color.
As far as sight height, you typically measure from the top of the barrel rib to the top of the sight.
BTW, the sight pin (and it's hole) isn't 1/16", which is what most people seem to assume. It's a wee bit smaller. Using a 1/16" punch to drive the pin out can result in a stuck pin, and a transverse bulge across the barrel rib.
