What you asked over here will fetch a lot of debate and controversial suggestions. How big you should go is totally upto you. Bigger tanks are:
1. More expensive to keep (and you may already be aware of saltwater being expensive)
2. Harder to maintain (well that's a bit debatable since the degree of maintenance varies from tank to tank)
3. Easier to keep stable
I personally prefers to suggest people to start with moderate size (like a 40B) so that, in case it doesn't suite your time and lifestyle, you can shut it off without much of a hit. Bigger tank = more initial investment = more loss if taken down. Alongside, I believe that you should set a budget and see for which tank you can "afford" the good stuffs instead of going big and getting stuffs that you will regret later. A well equipped small tank is always better than a ill equipped big tank.
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You wouldn't want to see my tank. I don't use fancy equipment and I am a noob 
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