On the Kowloon side, another option will be the Marco Polo Hong Kong.

The Sheraton in the same vicinity is also good.

On the HK island side, JW Marriott may be another option.

Personally, I like the Parlour Room at the Metropark Causeway Bay and I have mentioned more than once in this Forum. This is a high 3-star hotel located at the eastern fringe of Causeway Bay in a predominantly residential neighbourhood. Excellent access to transportation though. The regular rooms are small and have no view. Some harbourview rooms are slightly bigger, not much. Go for the Parlour Room as it should be within your $400 all-in budget.