Now i am thinking about buying one around 200 dolars
Well, any of the "greens" will get you most visibility per mW, as stated before. On the other hand, it might depend on your application for the Laser.
What do you want to achieve with it? Nowadays you get almost every color as bright as you might need. Bright enough to blind you instantly, if not handled carefully. So there might be a "maximum useful brightness" too for which you should think about.
If you are calculating "the most visible brightness for the money", you might be better off with a blue one. Despite blue is not perceived as bright as green when you compare the same mW, the blue Laser diodes on the market offer more power than comparably priced green ones.
So, if you think about buying something
like that one with a 2W 445nm blue Laser, you might still outshine every green one.
And you should always think about the fact, that this "toy" is a dangerous, long range weapon that can fry someones (your) eyeballs much quicker than you can say "oops".
Btw.: the red pointers where first on the market. It took a couple of years to achieve green with the optical trick of frequency doubling an infrared YAG. Blue ones where next, followed by green direct lasers and Violet ones. The yellow tones ones are still missing in direct diode, but are available in "frequency doubling" (DPSS).