OK,Jerry. you will definetly want to check out craigs page,
www.ledmuseum.org . He has done a few reviews, on diffrent lasers, its a nice place to start.
There are 2 types of standard leadlights <1mW (UK standard) and <5mW (US Standard). You will want at least a 5mW. I'm assuming here your sone is actually an adult?, so he can actually handle something with a bit more power, just going off the CEO part you brought up before. (unless he is going to use it for pointing to projectors etc, mods will be too bright for that. After your standard pointer comes those that are Modified to produce more power. ( i'll include arnold belands lasers in this section, even though he will totally despise it) The 2 leading laser sellers on the net are Arnold Beland
www.abeland1.com and Chris Tao
www.wicked lasers, they both sell standard and high powered lasers. They both sell on ebay as well. Arnolds high powered lasers are supposed to be unmodified and have greater power due to better quality MCA's. Chris modifies his but keeps the current low as well, but this is because he modifies the ones with better MCA's, hence he can offer more power. I have dealt with both, and i recomend Wicked.
As for batteries, i dont know about aaaa, but i know some greenies that run on N size batteries, but the quality just isnt as good as the leadlight.