Yes the military has Dual Laser systems with Vis/IR. On that note, it depends on what your set up is.
DBAL, Crimson Trace, Surefire, Streamlight, all make great devices. What you need to decide is this. Do you need a light? What color laser (Green is not only easier for the human eye to pick up, its also more daytime friendly.) How many lumens is good enough for the light. Warranty on the device.
Here is a fun thing to do with a laser. Have a friend or RSO ghost load the weapon (behind you, so you don't know if it was actually loaded or not). Then with the laser on, sight in and fire. Watch to see how you follow through. If it was loaded, and how you reacted when it wasn't. Lasers are a great teaching tool to see if your pulling, or jerking. In the previous test, if the laser bumped you might have flinched, or pulled the trigger wrong. You can do other things with them too, like practicing hip fire by aiming, then using the laser to double check. You can also use them to practice aiming while moving, holding the laser on target. Both right and left handed.
You need to decide what features you need, and what you don't. What color laser you want, and what kind of backing you want from it. Most of the military stuff is going to be very expensive, so be very picky when looking at it.
I would also recommend a bench rest for sighting it in. I have been extremely pleased with this one
http://www.cabelas.com/product/Hyskore-Parallax-Pistol-Sighting-Rest/741598.uts please note though. A lot of people use it wrong. You are not supposed to fire with it in the vice. The vice is simply to hold it while you adjust the sights. You fire it from the V notch as if it was a front bipod.
