This is what I run :Thunderpower TPC610C-ACDC. Purchased it from my LHS (same price as online retailers).

It runs on both 12V power supplies or 120VAC. It is able to store different memory profiles - so all my batteries are covered (including my heli LiPo packs). It comes with a balancer board that plugs on the side. My charger came with a pair of banana plugs with bare ends - which allows you to solder a connector of your choice. It has a fast charge mode, storage mode and competition car mode. It works well for my charging needs. When I go out to the track, I just plug it in and charge as needed.

I also have one of the "squid connectors" - they are are pretty handy if you have multiple types of battery packs. Get a LiPo charging sack too (if you don't have one yet).