Get an Airsal kit with a Tecno Estoril, 15mm bing and high flow, 3 shoe clutch and 16x45 gearing. Mine eats hills for breakfast. It's a one speed e50.
Ed is right though a single speed needs some time to get into the powerband before shredding a hill. Pedals help. Mine pulls pretty hard, but I've done some timing and point gap tweeks, clutch tuning, etc...