i would personally go for a class 4 IR, but thats an invisible beam and you might not like that. and I also believe it costs a bit more than 600 bucks...
go for a green, and I hear pseudonomen has some good deals...
you just missed a 200mW GB from drL, for 400 dollars, but you can get good deals on other comanies that have a better name like Optotronics or laserglow
also, a hercules would eb agood laser, though you would have to save a bit more money.
IMO, save up a bit more money, and get a really good and powerful laser.
regards,
amk
PS, if I were in your shoes, Id save a good 200 bucks of it, 40 for some goggles, and the rest for a LPM, Kenom sells em cheap.
regards,
amk