Jason B,
Yes, DR seems to have great customer service. Which is why I am a DR customer. However, having seen what other DR light owners have had to go through, I'll stick to another brand. Not knocking the company, my wing and my regs are Dive Rite. They work great.
Floater,
I've seen 18w, and I've seen 21w. They are both nice. But to be honest, for costing twice the price, I just can't justify it. Perhaps when I actually NEED that level of lighting, my thoughts will change. The other thing is if you are trying to communicate with your team via lights, it's not very helpful if your light simply drowns out your buddy's light.