I have an All Star. I've seen the Diamond and Pro-9 but never tried them on. The one you are missing is the Easton VRS. THIS one, I've held and tried on. I think it has the best padding of the lot. Have a gander:
http://www.anacondasports.com/webapp...oductId=127523
These ARE sweet. I'm thinking about switching fom the All Star. Have a look at the Easton and decide by trying them all. For my money, Easton, All Star, Pro-9 and Diamond - in that order. The first 3 are all exactly the same shape... take off any markings and it would likely be hard to differentiate between them. The Diamond allows for less periferally, because it is not cut back like the others. Have a look and you will see what I mean.
Go nuts. If you haven't tried one yet, you are in for a treat. I'd NEVER EVER go to an 'old style' ump mask again.
Scott