If I were buying a 589, and I will be eventually, I would go with one of the CW units. I really don't like the fact that the Rigel HV's are pulsed. I can understand pulse mode if the frequency is REALLY high (>1kHz) but a 700Hz pulse is silly, I'm sure you can see that when you wave it around.
I don't know if LaserGlow's handheld 589's are CW or pulsed off hand, but I know their GLPs are pulsed. Aside from that LG really has astounding customer service, I'm really surprised how helpful and responsive they are.
Oh, one nice thing about 589 vs 593.5/594.1; 589 is the sodium D line!