Congrats, and welcome.
In the US at least, all level 1 and level 2 charging stations (120 volt and 240 volt) use the same connector, which is the J1772 connector.
A 16 amp charging station is enough to charge the i-MiEV at full speed, but future-proofing yourself by getting a 32 amp station will allow newer EVs to charge at 6.6 kW (the i-MiEV has a 3.3 kW charger on-board) if you think you will be getting another EV in the next few years.