The average national cost of a 4 year university is around $18,000 per year, but it can be considerably higher depending on the school and region that you choose. Going "away" to college can add additional expenses over the long haul. You'll want to consider if the distance from your home is actually viable. Ask yourself the long-term value of attending a school out-of-state (with higher tuition) versus one closer to your home base. Will you and your family be in for a day long road trip to get you to and fro? Or will you have to rely on plane tickets? Consider that you'll need to fly during peak holiday seasons several times a year. While some universities make arrangements for students to remain in the dorms over breaks, consider if you'll want to spend holidays virtually alone on a deserted campus. Likewise, if you don't go home over the summer, you'll have the task of finding housing, potentially off-campus.
College offers you a chance to ease in to adulthood and living on your own. If you choose a college far from home that process speeds up considerably. While that may sound appealing, when the going gets tough (and inevitably it will) it might make sense to be within driving distance of home and parents.
You also want to think of the entire four plus years of your education. Most students end up moving out of dorms by their junior and senior year. If you're far from home, you'll have added expenses when you move off campus. You won't be able to load the back of your parent's minivan with supplies your parents gave you--you'll be starting from scratch with buying furniture and other household items. Make sure you plan for these kinds of costs as well. Even if you're shopping at Goodwill, these costs can add up.
Going away to college is always expensive. Make sure the campus that you choose is the right one for you--especially if it's the next state over or on your opposite coast. Make sure you're getting the most value for the money you'll be spending.