Great defensemen are pretty rare. The only way you'll get someone to trade Myers is to offer someone equally great. If you manage to get Myers you will feel like you overpaid if you think Enstrom and Sharp are a fair deal.
Unless it is a keeper league, I wouldn't go crazy trying to get him. Looked great but still young, and he looks set on keeping on him. Look to pick up someone else to fill in blueline by trading some of your PIM