Jeff / 46,
I kinda like this one:
http://www.xheli.com/thac6bachwac.html It has all the leads you need to charge 2,3,4,5, and 6 cell batteries.. You mentioned that you want one that will work with AC/DC without lugging something around... AC you won't, but DC you need something to plug in to the charger, a car battery, a car charger etc..
JPEE was correct I have the Bantam BC6-10 charger. It's a DC only, and I use a car battery charger to power the Bantam.
I can't recommend this to that, because the Bantam charger is the first really good charger I've had.. And I must say it's a marvel, however, it's expensive too.
Whatever you decide on, make sure that the charger comes with the appropriate discharge board, or at least one available.. Usually there about 10 to 12 bucks.
Out for the night,,, stuff to do.