Ha, I think you're overrating Dragic and Gortat, and especially the true value of a center.
Dragic is very good, but he's also not a top 10 PG. Gortat has played well, but he is not a franchise player, and is going to be looking for a huge extension on the wrong side of 30. Centers? Pfft...what is a center anymore? The teams in the finals would certainly disagree with you.
Don't get me wrong, they're both nice pieces, but ultimately replaceable. In any event, this is all mental masturbation anyway. I would have given up a ton for Harden,
because I believe that you need to acquire stars at almost any cost, and that role players can be found in the draft/FA. You can't even start to think about being a legit team until you acquire stars.