O-like has good quality lasers and very good costumer support. Wickedlasers are known for selling underpowered stuff at very high prices and ignoring customers once they have sold you something.
Nothing handheld above 5mW is legal in the US unless they comply with a set of rules.. I forget them all, but they are something like: It must have a shutter lens, it must have a safety key and safety pin and it must have a LED indicator.
Most people do not follow these rules as they have mostly been imposed to stop those idiots who blind their little brother or point the laser at aircrafts. You can purchase the lasers anyway, but DealExtreme will not ship most models to the US (for some reason they still seem to sell the "True" series there though).
If you want a quality ~10mW greenie Nova's X15 is a good choice. I am not too worried about the quality of my low powered lasers so I tend to get them from the DX True series or Ledshoppe. They are not always the best build quality and stability but they are really cheap and have power equal to or higher than advertised. O-like is good value and better quality.
If you want the best and have some money to spend - Nova, Dragonlasers, Optotronics are the companies to go to.
EDIT: Beam strength depends on power. I know Wickedlasers lower powered lasers should be ok with power, but I would still go to ANY other company before them. The better quality, the closer to the advertised power you will get. If you go for the right companies (Ledshoppe and O-like) the cheaper price will often get you stronger than advertised lasers.