Hello Eric,
aside from each one’s experiences with SES, which is a really solid sending service (an industry standard, I’d dare to say), I’d like to point out that any sending provider *works* with our plugin. We have some integrations with the most famous ones, which means we provide a dedicated addon that connects to the service via APIs, but apart from that there’s always the Smtp connection.
About SES: as soon as you exit the sandbox the limits should stick around something like 50k emails every 24 hours, which should be more than enough in your use case.
Michael