It makes a difference if you are just looking for great diving, or if you want to be somewhere where there is nightlife. "Love the nightlife, love to boogie?" you probably want to be more on the east side of the island near the big city. Looking for something more laid back, the Westpunt area is like a whole different world.
My wife and I stayed at All West Apartments, that Andreas mentioned in this post, last year and we just booked our return trip there for March. Nice apartments, full kitchen, great ocean views, 24/7 shore diving right out front of the apartments; and a short drive to Ocean Encounters West dive Op. No television, which seems a bit strange on the "slow side" of the island with not much to do at night; but the outdoor BBQ's make for a good gathering place to meet other divers. If you are looking for a more elegant place to stay, there are those options out west as well.
There are good shore dives on Curacao, not as plentiful as Bonaire, but not as heavily trafficked either. Also boat diving to some fantastic reefs.
Not much to do out west except the diving, the few places to eat Andreas mentioned, no nightclubs that I saw. The best meals we had were the ones we made ourselves at the apartment.
Whatever you decide, have a great time.
Safe diving, BK