I was in your position 6 months ago and went in Sept 2006 to look at hotels and book one.
We booked the Intercontinental Grand Stanford in TST which was ideal for what we wanted. It isn't in the middle of the harbour but has a decent side view of it.
You might want to try the Intercontinental Hotel which is right in front of the Peninsula hotel, although they were more expensive than the GS.
Its a good idea to look on the websites of the hotels as a lot of them have their wedding packages already on there so you know what you're getting, its just a case of seeing if you like the hotel and booking it when you go in February.
It is definitely worth making contact and pre-arranging visits with the various hotels so that you don't waste time if that is precious when you go. A very nice hotel was Langham Place in Mong Kok, their star room is on the top floor and looks out over Hong Kong from 3 sides, in the evening the ceiling lights come on and its like looking at the stars in the sky hence the name.
I'm not so sure on the island hotels as I am a Kowloon girl myself but I imagine the Four Seasons has a great view or the newly developed Mandarin Oriental.
Check the HK Convention Centre website, I think there may be a wedding convention there in February, definitely worth going and very handy for getting things discounted.