As mentioned, DC motor starting is not as simple as a lot of people think. They see their little DC motors on their convertible car top and think it's no big deal. But that little motor has a BIG battery capacity behind it. That's why a car battery and charger is not a bad way to go.
6A is a lot of power for something from Fry's Electronics (which, by the way is a West Coast only chain). And retail / commercial PSUs are not the type that will likely have any reserve capacity. A better way to go (if you don't want the hassle of the battery etc.) is to get an industrial duty PSU that has reserve capacity. I used to work for Siemens, so I can vouch for theirs, which can supply 300% overload for a second or two, long enough to get through that starting inrush. But even this would still require a starting resistor in the circuit, otherwise the starting current surge could be as high as 1200%! So first you need to know if your motor has a starting resistor built-in (many do) and if not, what is the starting current. Then look at that value as the peak that the PSU must be capable of delivering and go backwards from there to decide what size you buy.
