Hi, are you coming from Indonisia? It seems that you need to stay over night in Hong Kong if you want to cover the above mentioned places, since the best time to enjoy the Victoria Harbour (If you mean it by Hong Kong Harbour), and you can enjoy the fabulous Symphony of the Lights there.
I think the amount of money depend on wether you would just sightseeing or you still want to do some shopping here, if just sightseeing, round way air tickets, recommodations, entrance tickets of the attractions would be needed, if shopping, you might consider how many things you want to buy and how much do you want to spend on it.
Hong Kong has many things to surprise you, I think one day trip would not make you enjoy it.