Is this a good college mix?

I don't see any real safety schools in that list; heck, those could arguably all be reaches, depending on where you live and what your stats are. You might want to reess whether you're equally interested in all of them (a small college in an out-of-the-way place like Williams is going to make for a very different experience than Harvard, for instance) and replace a couple of them with surer bets.