A PSU is a PSU is a PSU. All it does it turn AC power into DC power.
As long as it advertises the ability to do the right mains voltage (generally 100-120V in NA, 220-240V in EU and Asia).
This one is great: http://www.hobbyking.com/hobbyking/s...arehouse_.html
this one is probably fine as well: http://www.hobbyking.com/hobbyking/s...er_Supply.html
Also I wouldn't push too much current through any of those PSU's/Chargers, I'm not convinced of their reliability to have a lot of current pushed through them and not blow up or catch fire.
One more other thing, the B6 should be able to take a standard laptop brick charger. If you look at it, it seems similar kind of.