I have a 75g. I had plans for lots of fish but as I started to watch the awesome things growing on my live rock and later added things like an anemone and a fire shrimp, i took it slow and changed my mind. I'm more intrigued with the corals, inverts and hitchikers in the tank than I am with the fish now. I have 2 clowns, too, who are hosted by an anemone and they lay eggs every month. So many awesome things in that tank besides the fish!
Sounds like you're enjoying those clowns! Once your tank is in good shape and seasoned for 6 months or so, get them a nem. And decide from there.
Ps - don't buy anything that you can't use on a larger tank. Sounds like you (and your wife) may upgrade in the future. Lol