I just joined a great babysitters site and it is really great. You can review profile of babysitters/nannys available in your area and you can schedule interviews. You can totally select all of your specific criteria that you are looking for in a sitter. And the best part is they come to you! Potential sitters or nannys email you with a resume and you review it. If you are interested you contact them!
If you are interested please message me your email address and I will forward the site to ya!