highcheese, The blue Dynasty was one of my favorites as well. The Exo is as close as I have found. My son had a white one (-8.5), a red one (-8.5), and black one (-5) and they all have still held up like the blue dynasty did.
I missed the opportunity to buy a -5 Blue Dynasty a couple years ago and kick myself for it. He has a tan/green -5 Dynasty but I don't think it was as good as the blue one.