Don't skimp or be tight on budget when buying a charger that needs to go up to 6S. Seriously. You will go through many many cars and trucks, before you ever need to change chargers. So buy once instead of continuously "upgrading" as you get a feel for your charging needs. THIS charger is the last charger you will buy for a long time and will hold great resale value throughout it's life.

Another thing to consider is support. Make sure the charger you get has good manufacturing support. Hobby King makes a cheaper charger capable of charging up to 6S, but I have no experience with them.