[jhammer]

I am obviously biased [1], but if you want a nicer (native) UI than Sendy, you might want to check out our app Direct Mail: http://directmailmac.com

It has a built-in delivery service, but can also plug into SES or any other SMTP service for a one-time fee.

[1] I am a developer of the aforementioned app

[jaysonelliot]

Looks nice, but it's even more expensive than Mailchimp unless you have your own mail server.