Their other PS, the "Pro 40" vs the 'Super Pro 40' would be just as good and a $20 power distribution box would provide addiitional connections to the supply for less money in case you ever needed additional connections which doesn't sound tooo likely. Either of these is 540watts and thats more than you really need for a 360watt Duo3. You only require something in the 430-450watt range to run it a full power.

If you don't need to run it at full power, you can easily get by with a less powerful, less expensive supply as long as it provides about 20% more power that your charging requires of the supply. So if what you're charging at most requires ~150watt (6S 6000mah for example), you'd need a 350watt supply to charge this with both ports.