Echo and Try All Appear to be the best rims at the moment, or so I've heard. Apparently the 07 echos are stronger than the 06's and come in more colours than the Try All. They also have a thicker sidewall so that you can grind them more often, for those who prefer spend ages dialing their bikes in perfectly. So the Echo 07's get my vote, mostly because i grind my rear rim often and will probably end up getting one soon.