I or rather, nobody here can give you 'all' the information but let me try to give as much as I can:
Kennedy Town is definitely a greatarea to consider - you'll get a good 600 - 650 sq. ft. 2 bedroom flat for $12,000 p.m. Even though it does not have an MTR yet, there are at least 8 different buses going to Central. The travel time is around 15-20 min. Full of shops, supermarkets, eating joints (mostly local, though). Great sea views. Library, post office, parks - all nearby.
You could consider Sheung Wan as well - closer to central than KT but I personally don't like it as much since it smells of dried seafood all the time.
If you love partying, night life, pubbing etc., Wan Chaicould be the area for you - again about 15 min. from central but you'll get a much smaller place compared to KT since itself is like a small commercial hub.