I assume you are talking about sights.
I'd go with Novak. Novaks pretty much invented the "low mount/concealed carry sight". They offer many options, from painted-on white dots, to tritium insert night sights, to plain black to 23kt gold inserts (which sound expensive, but aren't any more than Tritium, and are surprisingly bright and easy to see.)
Novak's shop built my Para Ordnance S-14.45. They do excellent work as a custom shop, have FANTASTIC customer support, and are just plain old-fashioned NICE folk. Plus they hail from the state where I grew up--WV.