Get the biggest tank you can afford. The tank is the cheapest part.
Also, the best thing you can do is find a good local store with KNOWLEDGEABLE staff. They are your best asset. There are many different methods for filtration and set-up, so it is good to do your homework first.
I myself have two tanks. A 30 gal micro reef with several corals and three fish. The other tank is a 29 high eel tank with three inhabitants. Both tanks are filtered by the Berlin method using Live Rock to provide biological filtration. My reef has no measurable Nitrates and the eels could live in mud, so I don't worry about them much.
Even for fish only tanks, I reccomend the use of a sump. It makes the whole maintaining salinity much easier. I have a line drawn on the side of the sump, and each day I just fill to that line. The salt content says pretty consistant that way.
Good luck, and post here with questions as you do research. Everyone will have a different answer, so you will have to decide for yourself what works best for you.
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Every passing hour brings the Solar System forty-three thousand miles closer to Globular Cluster M13 in Hercules — and still there are some misfits who insist that there is no such thing as progress.
Kurt Vonnegut - Sirens of Titan
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