new guy with a new gun and looking to add some improvements. i know my sd9 has the trijicon front sight, which is really effective. but i'm thinking i want more. where can i get the night rear sight? also, should i go with a laser or rail light? this is for home defense. if i need to go out and about, i plan on removing the light/laser. i have a tac light with strobe, so i'm just wondering if i'm better off leaving it alone, and using the hand light, or something different. please keep in mind that i have little knowledge for tac stuff in the house. wife and i are planning on taking NRA pistol courses this summer.sorry so long winded