I have my DNS server on site I am looking to find a secondary in another city to protect in the event of a failure.
Any sugestions?

Free (but check first to be sure):
http://www.mydns.com
http://www.undernic.net
http://www.hn.org
http://www.domaincontroller.com (paid options as well)

Paid:
http://www.zoneedit.com
http://ultradns.com

Note: I haven't used all of these so test first (as a back they should be fine though).