If you are happy with them wiggal, then don't be suckered in by all these pics in papers & the media etc saying that you're only sexy if you have heaving huge bazooma's. And your man is happy too - that's a bonus by the way, not a prerequisite.
34A aint huge, but not tiny either. And, at least you have some - there's many a sufferer of breast cancer who would give anything to have 34A's...... ;-)
Surgery is not a soft option - and to be honest, unless your small-ish boobs are causing you great psychological distress or severely affecting your self-esteem and self-image, why on earth put yourself through it?