I have a Super Nova, just one version before the one that's out now. The newer one is easier to program than mine.

I like mine a lot, and haven't worried about Lithium cells. If you're into smaller electrics (or think you might get into them), then buy a charger capable of doing them. I don't think lithium are relevant to glow planes for now. (We don't need to save weight by paying for state of the art technology.)

You really should try to get a better charger soon though. In the meantime, I wouldn't rely on the wall charger to do that 2700 maH pack unless you have a voltage meter. At least then you can test the state of the pack.
Dennis-