1-chorus pedal...
2- Wah Wah pedal
these two are the traditional pedals, and he'll want one of these two at some point... You can buy relativly cheap multi-effects boxes for about $100, and to be honest it's very very good value for your money (something like the DIGITECH RP 100)... something that you could maybe buy as a joint present from you and the parents or anyone, cos his jaw will hit the floor...
