Its a matter of finding one with enough watts and the right voltage range. The GT Power A-6-10 accepts voltage from 10-18v. You need one that will supply ~220watts to run the charger at 200watts. Some laptops use big supplies - my old Dell 9100 uses a 7.7amp, 19.5v (only 150watts)supply which would be too much voltage and not enough watts.

I know you can find more out of a desktop supply, but you have to convert it to get it to work as an RC power supply - there's a ton of how-tos out on the net. Either type would do as long as it meets the voltage range and supplies enough amps to charge what you want to charge. You don't have to get one with 220watts, just be sure the supply generates about 20% more watts than the batts you're charging require - the 20% is to take care of inefficiency in the charger. Other wise you put yourself in the charge current limited mode which takes longer to complete a charge.