I prefer Trijicon. Some will argue this because Meprolights are cheaper and in the beginning seem just as good, but Trijicon generally last longer. I've had several friends who are FFL's and multiple contacts in LE and they all use Trijicon when it comes to their gear.
-You can install the night sights yourself, but a lot of gun stores will install them for free if you buy the sights there as opposed to online. If you choose to install them yourself, you'll need the proper tools (a radiused screwdriver for the the rearsight screw and a 3/16 hexagonal wrench for the frontsight screw) and Locktite. They are several strengths of Locktite. You do not want the one that needs heat to undo the bond. Keep in mind, at some point you're going to have to replace them. With Trijicon it'll generally be around the 12 year mark and Mepro's will be around the 8 year mark.
Good luck-