We were using campaignmonitor.com until we found out about sendy.co
Sendy uses SES to send the emails on our behalf - so far so good - we do a weekend update to about 1500 address (so far) and it's worked quite well.
Someday I'll script something to dumb the current user email list into sendy so I don't have to export it to csv and reimport it every weekend...
I asked a similar question recently
I'm using Mandrill for transactional email, and will most likely start using Mailjet for email campaigns.
I believe that Mandrill etc give a better deliverability compared to SES.