HA HA! yeah, that's been a problem for me too. There are just too many varieties of fish out there to choose from. I want one of each.
Put in a large sump and a big refugium. This will increase your water volume and filtration capabilities.
Buy the nicest, biggest protein skimmer you can afford and make sure you have more Live rock than you need. Doing these two things will increase your filtration and in turn allow you to have a larger bio load (more fish).
Other than that, yup, you could always upgrade to a bigger tank. How about 250 next time? And then 500 after that? AHHHH!!! This addiction is taking over my mind!!! :scared: