Sumpless with Success?

[Logzor]

How do you all feel about having a successful mixed reef without a sump?

I began my first mixed reef on the first of September 2007. I have a 55 gallon tank with a 4x54 tek light and a CSS 125.

So far things have been going great. Even better since I got my own RO machine and better powerheads.

I have been getting into SPS lately. I now have 3 digi's 3 monti caps and 3 acropora's. The rest of my corals are a variety of LPS and Softies.

I do a 7 gallon water change at least once a week.

Can I have long term success without a sump? My tank is not reef ready and I will not upgrade until I can move from an apartment into a house. I really want to grow this tank out well so I can have a really good excuse to move up to a 90 gallon tank.

Also, I have three fish. Two baby clowns, a mature diamond goby, two cleaner shrimp, 35 hermits, and 35 snails.