Replying to OH NO A BOOT QUESTION!!!

Hey, I currently own 07-08 lange freestyle boots size 27.5. I have recently been thinking to either switching to the salomon spk kaos or the spk pro boot. I like the look of next years spk kaos and the spk pro is alright. Just a few questions for the transition.
- How similar will the boot i currently own and the others fit? ( i know the buckles will cause it different im talking about instep i have a very high arch.)
-The new spk kaos has the "toe Box" gimmick or working device lets face it everyone hates to bang shing bang and we all will go out of our ways to cure that shit.
-What do you think the better boot is? Spk pro or Spk Kaos.
-How does the sizing run on them.
-Are they comfortable.

These are by no way questions to determine what boot im getting just to lead me to the right one. I do understand that you should always try on boots before you buy them which i will do so.

More info that could or could not matter: 5'11. 180 pnds . High arch in foot, Size 10.5 shoe, medium sized width on my foot not to wide not to narrow