This is a solid charger, its 100watts and would take care of your present needs and allow for those needs to grow in the future with larger lipos or larger LiFes. Theres several using this charger here and feedback has been good.

This is another, less powerful AC/DC charger that will take care what you have presently. Its 50watts and would charge uo to 5000mah 2S lipos at 5amps. 2S lipos above 5000mah or above 2S will run into current limiting as the charger limits current to stay under its 50watt power limit. You wouldn't encounter limiting as soon with the Passport and its 100watt output power.

http://www.hobbypartz.com/thac6smbachw.html