I went with Fastmail, with their domain. If I were to do it again, I probably would use my own domain (and I may do that in the future). I can't say enough good things about Fastmail's UI. It's just as snappy as a native app, and is both consistent and intuitive. Outlook.com is also really nice. I use it for work email, and have no complaints at all.

Thanks for the StartPage tip! I'm going to start doing that whenever I want a second opinion on my search results.