yes, plenty. I set my 210 gallon tank up for $4000. In this hobby, the bigger is always the better. I would probably start setting up a list of all the things you need, and then get the biggest possible tank that will fit into your $3000 budget. We can help you with that here. First, you need to decide whether you want to do fish or corals. Most fish cannot go in a tank with corals, this is why it is one or the other.
JUst fish, or FOWLR, is much cheaper, as corals require expensive lighting and more maintenance as well.