Best Program or Way to Sync Contacts to Mobile Devices

Trying to find a way to have a public contact database that will sync to mobile phones, (Apple and Android). In the best case, we would keep something local here at the office or in the cloud that we would be able to assign permissions to a couple users to be able to change them while everyone else just has read access. The big catch is I want the users in the field with iPhones and Droids to be able to see this contact list easily but is sperate from they normal local contacts or their exchange contacts. I found something like CiraSync that will let us use public folder contacts and push to the phone but i have never used it before and was wondering how anyone else is doing this.