No, its the motor, not the esc that determines amp draw. After than your setup (size, weight and gearing) also affects amp draw.
Chargers come in all sizes and prices. Prob be good to get a AC/DC powered charger since won't have to buy a separate power supply. If you're just doing 2S lipos, Triton2 is a good balancing charger. Hyperion 0606i is also a good AC/DC balancing charger.
http://www3.towerhobbies.com/cgi-bin...&I=LXVRS6&P=ML
http://www.allerc.com/product_info.p...oducts_id=3367
There are others.