I have been contemplating the same decision to buy 1 charger that can charge 2 lipo batteries.
I have a Ice, Checkpoint and a Supernova that could do fine but with the amount of gear we have to carry to the track its starting to get much.
Cant wait for lipos to be come the standard as well as brushless for our local racing.
Ive been looking at the Hyperion Duo
http://www.amainhobbies.com/product_...ducts_id/20720
This is the same as the Supernova mentioned above.
http://www.hobbycity.com/hobbycity/s.../_Balancer_12S