I have to agree with hakzaw1. unlimited duty cycle is not so cool. many nice lasers have a respectable duty cycle of three or even five minutes. Some may even go longer, but why risk damaging your diode? IMHO, the only lasers that should be treated as if they have unlimited duty cycle are really really low powered ones, and ones with TEC cooling. not many handhelds have TEC, the only one I can think of is the hercules from laserglow. this thing is huge and muy muy expensive.
optotronics has the best advertised divergence rating I have seen short of using a beam expander