Point "at sign" (@) to a host name rather than an IP address

I'm using AWS S3 to host our web site.
I've created a CNAME "www --> www.ask-ziggy.com.s3-website-us-east-1.amazonaws.com" which works fine for http://www.ask-ziggy.com.

However I would also like http://ask-ziggy.com to point to that same location, unfortunately it seems I'm unable to do it:
CNAME "@ --> www.ask-ziggy.com.s3-website-us-east-1.amazonaws.com" gives "You can't use the at sign (@) in a host name."
and an A entry requires an IP address, no host name.

The problem is that I can't count on AWS to keep the IP address resolving to my host name static. It's currently 205.251.242.171 but they are liable to change it at any time.


How do I make sure http://ask-ziggy.com and http://www.ask-ziggy.com ALWAYS point to the same host?