Paris is WAY expensive! Be warned! It might be better to go somewhere just as nice, but easier on the pocket.
I've made the mistake before of going all out on a partners b-day, and the inevitable happens.....the next b-day you're expected to top the last one!
If you can afford to do bigger and grander things as time goes by, then by all means go, but would you prefer to go there for a b-day, or a wedding anniversary?