I'm planning on selling both a 350mA and 700mA version, since those are the two common max currents I've seen. Going from 350mA to 700mA is just a matter of soldering on another current sense resistor in parallel. Easy to customize the output current yourself too, since I've left room to put three current sense resistors in parallel.
I believe that if the LED's are going to be connected through some wires then a few inches of PCB trace won't matter too much. I might move them closer but I still need to layout the on-board MCU.
Might have to get a little creative to fit in six 0.2" spacing terminal blocks. Also I'm looking for a way to be able to stack these boards while being able to screw/unscrew the terminal blocks.
Pricing: probably around $25 + $5 shipping for a fully fitted board.