I'm only buying the Colt over BCM due to availability within driving distance. I'm impressed with BCM. I'll let you buy me a Noveske.
I just thought I'd note that you can get a Noveske uppered gun for about $1K, or roughly the price of the colt, if you shop smart and don't have to have it tomorrow. Their N4 light upper which is the configuration you want runs about $800. If you wait for Midway to have a $100 off on orders over $xxx sale it becomes about $700. That gives you nearly 300 to do a lower. I'd also note the Noveske comes with a Vortex flash hider which is probably $50 more than the A2 birdcage on the colt (and is much more effective in my experience shooting in low light).
Honestly though, it sounds as if for your uses you likely wouldn't see any real difference between the colt you are getting and the gun described above (or a PSA or BCM for that matter). If you are going to shoot irons from field positions you will never notice the difference in accuracy. It sounds as if the gun wont be shot suppressed and not run real real hard. I doubt you'll ever feel bad about your Colt.
Most of the critiques I see about light use clearly come from folks that have no training in using a light and don't really understand the how and why of using a light.
don't know when the last time you tried to shoot with an LED light in your eyes. I fine it next to impossible to hit anything with that light in my eyes.
Did that involve shooting right into the light? Try that force on force with an airsoft. I think it is probably true that a very bright light in the eyes will daze some people. Also I doubt that all bad guys in all situations are walking around gun out ready to instantly engage a light source. That said to act as if a light couldn't ever draw fire is naive.
There is a lot more to using lights, and a lot more issues to consider, than most people think.