I have several lights I use for work. All the major light companies, surefire, steamlight ect are going to sell you a good product. You are gonna want LED because those little 3 volt batteries for these lights are expensive. The one you put up was fine being that it is LED.
You might want to think about buying a light that has the option of a pressure switch. I know from experience that trying to use your support hand to operate your light, while trying not to get shot at, can be stressful. I am sure that surefire makes something like that. I like the Streamlight TLR-1 with the pressure switch attachment. I don't have a light on my SNT, but I do have it on my Bushmaster AR-15. It works fine, but you will spend a few extra bucks.
I did not have the pressure switch at first but after looking for a guy who ran in the woods after crashing a stolen car at the end of a car chase, I really wanted something that required me to do the least amount of moving/thinking about the gun and would just let me focus on my safety and finding him.