I'm jealous. A really good controller is the S06S from BMSbattery or the Sine wave one from Greenbikekit or the 15 amp (14A?) sine wave one from PSWPower. If you need 48v, you can find them on Aliexpress.I pre-ordered a (hall-)sensored version of the Xiongda YTW06, which is being built right now and will hopefully be shipped before Christmas.
Now I need to decide about the controller and a lightweight, easy to use interface. Any recommendations for the now sensored motor?