With many years of sales and sales management, I can tell you that people buy from people they like. So, you need to look at your business model. Is your existing Sales person telemarketing or out in the field making his presentations and calls and demonstrations? If you are currently using inside sales, then you can hire someone in your area to work the East Coast. If your business model is in the field, then you will need to hire someone that lives on the East Coast. And if that is the case, then I recommend utilizing an agency which will bring you a higher quality candidate.