Have you given FastMail.com a look? They seem to be a pretty popular paid solution for folks migrating away from Google for email.
On another note, last year I opened up one of the free tier Zoho.com accounts to power email for a domain. The interface isn't as nice as fastmail's in my opinion, but no problems with it thus far and hey, another free option is always nice. I should note that I send and receive relatively little email with it, so I may not have noticed any minor outages had any occurred.