I don't know skis or brands, but I'd say if you are looking for a fatter ski for NEW YORK, I'd go 96 at the waist with some rocker.
I use the Jski Masterblaster as my quiver of one. It is not super fat but may fit OP request for the next width with different function than the 70mm. You should think about it. Since you have a skinny ski, you could make an argument that you go wider, but we just don't get the type of snow that justifies 110 over a 96 even once a season IMO.
From time to time I have thought about building other skis into the mix, but this performs close enough for me as a narrow ski, and has eaten the (admittedly handful of) really deep powder days on the east coast, one or two storms in the 2-3 feet range over three or so years.
I took them to Copper CO two years ago, and they did great, including side country hike-to runs starting from something like 11,500 or 12,000 feet - no groomers get on those runs. I did fall forward on my first turn on the steep hike-to stuff but I think that was because my weight distribution was too east coast (90-10 outside/inside ski) versus a more even weight distribution of out west (or deep pow).
It has tip and tail rocker, but still engages well on all turns including groomers, even quite firm. My home mountain is Belleayre, which can get very firm, very quick.
It is 96mm underfoot. I think I ski the 172 or 176 (I am 5'9). It can hold groomers well (though on the super duper firm days, I would put money on your 70 mm).
For performance, the MB performs really well in powder, trees, bumps, but you can also easily ski groomers and steeps. I have skied two or three 2 foot plus storms, and these skis really ate it up. I don't think I had to lean back or do any of the 'tricks' you might need to do if you did not have enough float or rocker.
Another cool think about Jskis - you can ski them several days with a no ask return policy. When I bought it was three days, now it is five days. It is on the honor system. Also, you can call the company, tell them what you are looking for and they will recommend a ski type and size. Sales are directly through them online. I think the founder may have started and sold Head; if not Head, it was a different company.
Other than MB, I haven't skied them, but skied consistently with a guy who used Head Kore 88. The construction seemed great, probably lighter than MB. I imagine the Kore in 88 93 or 98 would be good too.
Good luck!
