if you confirm want to hold your banquet at amara or any specific hotel, you should confirm now to secure the current price. if you book later when the price list for 2012 is out, then you would have to pay more. make your decision soonest so that you will save more. i have not seen the ballroom at crowne plaza but changi is too far for me. remember to always consider the distance your guest have to travel.
as for which i will spend more on, i don't know cos i base on different thing to decide what i really need.
as for banquet, i will look at the price (no. of stars of hotel), ballroom (high or low ceiling), location (near mrt and more bus services available), perks given by hotels.
for PS, no point spending too much buying additional photos because you will not look at the photos frequently after your wedding. i will purchase maybe another 10 more if i really like the pics. i will also buy raw copies of it as it will be cheaper and i can view it using a pc. it saves place to store your album too.