I don't know of any that don't support OpenDNS, give it a go the worse that happens is you stop using it. I've been using OpenDNS for ages (on both IS and SAIX) and haven't noticed any serious problems because of it.
Just remember you will need international bandwidth for it.
http://www.dyndns.com/ have a look - IS DNS is 168.210.2.2 & 196.14.239.2 and SAIX DNS 196.43.45.190 & 196.43.46.190 on static routers as far as i know...