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Check out http://nsone.net - newer service with a unique approach to geo/load balancing/failover using user defined rulesets (filter chains and data feeds).

You can do latency based load balancing to non-AWS endpoints with Route 53 -- the limitation is that you have to associate those endpoints with an AWS region. If your endpoints are not anywhere near an AWS region, you're stuck. Otherwise fine!

Rackspace Cloud DNS http://www.rackspace.com/cloud/dns/

DNSMadeEasy for $30/year

That's for their DNS Small Business Plan only, plus $55 per Domain per Month for Geo-DNS (http://www.dnsmadeeasy.com/home/compare/)