I had been using Google Contacts with a minor "hack" of using the "file as" field as a three digit priority field, but still with the person's name and leading zeros. So a contact record looks like this "095. John Smith". Then when I come across a contact record I change that number, almost whimsically which makes it kind of like a bubble sort. As the same time, I made effective use of labels (tags). I have, however, recently switched to Nimble which I like, but am still getting used to. Syncing with Google Contacts is a mandatory feature for me, and Nimble allows 2000 syncs without additional charge via a third party.