Well, that sounds like your best bet. The government health centers can get run down (I remember hating the pool at the Xinyi Sports Center some years ago). Also, there are times when senior citizens get in free, and if your work out times coincide with this, it could possibly ruin things for you (it can get quite crowded at these times).
Also, during the summers, the high school kids can make for a sucky workout. They tend to come in small groups of three or so and hog the machines (you can forget benching or squatting at these times- but you do learn to get creative with the dumbbells!).
Anyway, O3 Fitness sounds ideal for you needs.