A parent, not a student but will still comment so feel free to ignore. You seem to have opened up options that would potentially cost you more than your instate options. What you were willing, wanting to pay would have ideally been sorted out and communicated to your son before applications went out.
If Clemson, LSU , Auburn , etc. end up less expensive than Georgia Tech, they would all be fine in terms of engineering as an undergraduate. What budget did you give your child? If there is a budget, provide it and let your kid decide from there , based on criteria important to him. For engineering, cost, fit, ABET accreditation, recruiting are important.