I think it would be dependent upon what you are working with. As I know we will be obtaining our own server soon, I am going back to school so I can get my CCNA.
The best institutes for networking are dependent upon whether you are seeking network security, physical implementation, or protocol. I would suggest finding something local to you as it would probably be more cost effective. After meeting with the education personnel at my school and finding them and their course sound, I moved to enroll there.