[lingwendil]

Looking from the graphs the Luxeon Royal Blue sits about 1350mW output or so at 1A (assuming proper/adequate cooling) with a 3.00V drop, and I like them around 700-1000mA assuming your heatsink can take it. The lower voltage drop is worth it for a bit better efficiency.

Also, In my experience the Luxeon can take higher temperatures before output suffers, but they are less tolerant of overdriving them the way the Crees are, which is a non issue usually if you design your rig right.