If you are looking to ski both on and off piste, the Blizzard Bonafide (98mm) is the best choice. It has just the right amount of rocker/camber mix, a great flex profile, is very stable at speed, and rails on the groomers for a ski that wide. The mantra and Rossi E98 are both stiffer, more frontside oriented skis. The Bonafide is also much more nimble than you would expect from a 98mm waisted ski. I wouldn't definitely recommend going with the 98mm range, you will get increased float in soft snow and stability in crud, without sacrifices much on hard snow. You won't regret it.

on top of the bonafide, I'd recommend you look into the Nordica Hell and Back, they are fairly light, yet incredibly strong on the hardpack, and super fun in the steep, bumps, and 1 foot to 1.5 foot of pow (recently skied week old stashes of powder around Alta, and they managed really well). I have them in a 185 size.
I had the opportunity to try both the Blizzard and the Nordica last year on the same day, and found the Bonafide too heavy for me, and i couldn't quite find the right way of using them. On the contrary, the Hell and Back seemed more "natural" to me, and I instantaneously felt at ease with them, thus my choice!

sideshow. K2 is coming back in a good big way.
scmidt.
McConkey
Plake
Hattrup

alllll on K2 and i think the company realized there mistakes and learned and improved the procuct. great ski get the volkl, only cause thats less people with the hardside:)
i dont like a tail rocker, i ski forwards, i like stif stifff stiff stiff tails and super stiff skis overall. the hardsides are that. my boards in pic below