need a pair for all mountain

It's a matter of preference. As long as the boots are comfortable on you and you can wear them for extended periods, your skiing will benefit.
I ski on 90 flex Langes and think they're the greatest boots in the world. A Lange boot might not even fit your foot.
Talk to a boot fitter at a ski shop and tell him / her what you're looking for and they can definitely help you out as far as comfort and all-mountain flex.

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