maybe the x4 80?
but id be looking for larger and in the dual port capability.
either the icharger dual, the tp820, a hyperion
having the dual port is nice. the other night i was charging my transmitter battery on one port while doing the starter box on a 2nd port. then i hooked up 2 electric car batteries on the ports and got them done in about 20 minutes

or wait a month and get this bad boy

http://www.usastore.revolectrix.com/...ual-PowerLab_4