<p>Why don't you apply to all three and see how the financial picture looks? $20K for undergraduate is not unreasonable if it's an experience you really want. There is something to be said for seeing a new part of the world.</p>
<p>I fear, however, that the cost difference may be more than you anticipate. Do GTown and Tufts guarantee 100% of need? Have you factored in the Profile? If these schools gap, and the difference goes much past $20K, you have a great opportunity in state.</p>