Hi Tea,
Deco - engaged our own. My mother's fren, who's also a Catholic.
Choir - also enlisted the help of frens who are part of their choirs in their own parishes.
Priests - we had 2 priests. Main celebrant is Fr. Anselm from SPP, con-celebrant & solemniser is Fr. Arro.
from our experience, the church florist charged quite expensive...esp for the kinds and amounts of items she was giving us. Not sure if she has revised her quote now...
Choir, well...can't help u there.
We absolutely loved our own choir. heehee...oh, but I understand that from now on, if u want to use the LCD TVs, you have to engage the church choir ($250) and an additional $50. If church choir was not engaged, then it will be $100 to use the LCD TV.
Rehearsal timings...the sacristian is pretty sticky with the timing. 630pm to 730pm. If it stretches beyond that, be prepared for her super black face. (when she first meets u, it's already not-so-friendly lah). Church deco...she also controls the timing to put up the deco very strictly. Not sure if that would be the case for couples who engage the church florist.
Anything else I can help you with, just post here or PM me.