Evite Alternatives

Evite frustrates me. There are lots of bugs in the messages and hassles in using it, but the real issue is that I have to get an exception to organize an event with more than 750 people invited. I've gotten the exception so far, but it's on a case-by-case basis and at point they might cut me off - and they do. (Dear Evite, I know it's to limit spam, but isn't it obvious that I'm not a spammer? Why are you pushing away your best customers?) So, anyway, I'm looking for other options...

Here's what I've looked at so far, but none of them are quite fitting my needs:
What's the Plan
Google/Outlook/Etc Calendar Invites
Facebook Invites
Any that I'm missing here?