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I skied the Alpha 1 for a season and i must say it left a lot to be desired. The Thall and AR7 are softer. Because of the elf shoe shape of the alpha it makes it ski a ton shorter than it is (basically my 181s skied like 160 somethings) which made it really easy to butter on but unstable on larger jumps.
The punx is a rockin ski. super buttery and soft, but retains some pop.
I also just got some Diams from RMU and they are the shit... but it sounds like you've already got your mind pretty much made up.
I've heard that libertys dont have the strongest cores... but thats hear-say I dont have any experience.
I duno man, Id say if your only complaint is weight then stick with them. It'll make you appreciate a lighter ski even more. I mean, weight usually means a ski is built pretty solid. so at least you have that.
hell man, look for something used even or previous year cuz the Thall isnt gona change from 2010 to 2011. And the AR7 is honestly so similar to the Thall you could save a few bucks and get the AR7 and prob be just as happy. The only difference is that the THall is a *touch* softer with a slightly faster base. I duno if youre interested or not but the store I work at has AR7 demos w Z12 rental bindings on them for $513 in 161 166 and 176 lenghts, w $50 off and free shipping right now.