SES is as good as Mailchimp and very inexpensive. Too bad Mailchimp phased out Mandrill, which was reasonably priced and had a nice interface. SES has no interface at all but works great.
If you like SES you should check out Email Octopus. It hooks up to SES and gives you a nice GUI for putting the messages together. We moved a good sized client over to them and their marketing people wanted a GUI and it filled the niche nicely.