Streamlight, Crimson Trace are good high quality durable lasers. You are not going to find a good green laser under $100, high quality much less so. I have CTC Railmasters (red) on my night AR15 and (green) on my 9mm AR9. I have the Laser Genetics ND3AR on my predator hunting AR15.
There are a few things to consider with lasers. Activation...while I might like one style better than another, if it is on a long gun that may be bagged, bumping the switch on is a concern. Cords for activation can be a PITA. The CTC Linq is pretty cool... Also, if you are going to run a light, getting a unit that activates both is something to consider. Also use...hunting and matches is one thing...SD is a whole other thing and I want it stupid simple in that case. I have one of the Burris Units with Green laser, IR Laser and a FF on top. It is insanely cool, but too complex unless I was going to be training with it all the time.