Oceanic's BioCube has a good reputation, but most of the brands mentioned are widely used on this forum with good success.
One potential difference that you need to ask yourself is glass or acrylic. Glass is heavier but a 14 or 30 gallon is still light to move when empty. Acrylic I hear can scratch a lot easier, so if there are kids in the house that may be a concern.
Good luck...this hobby is addicting.