If possible, it is always advantageous to see the candidate's work before you make an offer. Many progressive hiring managers are using their networks to find out how the person is viewed in his current company, and they often ask for work samples or evidence of the kinds of work the candidate does. Close quickly The final step is to get consensus on the person and make a quick decision and offer. Many candidates are lost in these days of tight labor by a slow decision-making process. Candidates may have multiple offers and will not wait for yours.
Speed is a real differentiation in the labor market.
If you have made a real effort to work your resources and are still empty handed, I think you must realistically decide if you are asking for too much. If you are sure you are realistic, then consider using a recruiting agency. The positive side is that recruiters are highly motivated to find a candidate and many have extensive resources and contacts that may unearth someone you couldn't. The downside is that they can never know what you are looking for as well as you do, and they are usually quite expensive. The Internet has opened doors that have never existed before, allowing access to people everywhere.