LLoyd. Have you looked at/used a Crimson Trace Laser Grip? All one has to do is grip the gun and the site comes on. No extra buttons, no muss, no fuss. It is as natural as can be.
The CT grip is by far better than tryiong to hold a flashlight (Although I do recommend one at night), and much easier to used than a flashlight. The laser emits enough light that I can see the target outline fairly well out to about 30 yards, even with my corrected eyesight, and in the darkness of night.
Ideally, both sites would be great, but at the price quoted, I would spend the extra money and add the CT grips. JMHO,