What sort of charger do you have?
If you have a cruddy charger then get the charger.
As for the Tx (everybody has a personal preference, mine is the "mars") the Mars is really really nice but the ex11 has 4 channels and a heap of tuning options and is a little cheaper. I would get the Mars over the Ex11 (or anything for that matter) because it looks awsome
and has an overwelming amount of things you can change to fit your driving style, there are 5 levels (5 having the most features) and most people only have to go to the 3rd level to be satisfied. But if you do get the Mars be warned, they EAT batt's. Good luck in your decision.