I would get the biggest tank you can, simply because the bigger it is the more forgiving it is. More water equals stability. I found that once i had a 120 things were pretty good but at 180 they were even better and I had a more room to work with. If you get heavily into sps a 120 may or may not last you several years.
Personally, a 300+ gallon would be a fantastic upgrade after several years of sps growth in my 180, but is probably not in the cards.
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