Extra width can make huge difference. As does rocker. I've got Fatypus D-senders, S7s and Kuros.
The effect of rocker is pretty damn big. My S7s float much more easily than the D-senders depsite being pretty similar in size.
The Kuros extra width and full reverse camber makes them the easiest to float by a mile and the ride on them in pow, chop and crud is incredible. Does make 'em slower though
I ski in CO so the pow is light and probably requires a ski with more width than regions with heavier snow. That said, if your looking for a pure powder ski then I'd go as wide as possible, and with a lot of or full reverse camber. Despite being the biggest ski I've used the Kuro is easily the most agile in trees and stuff, they pivot and turn in pow much more easily than any other ski I've been on, despite their size.
The downside of being completely reverse camber is that they're probably the worst skis I've been on on hardpack and ice. Thats why I got the S7s, they're my resort powder ski. In pow, chop and soft crud the Kuro slays the S7s and D-senders but they're miserable anywhere else. The reverse camber gives an amazing quick turning feeling in pow but makes them feel like the super heavy snowlerblades on hardpack...not fun.
Although none of these would be good for landing switch in pow I think that the effect of their designs on their behaviourwould apply to a fat ski designed for landing switch. Basically, if you're only going to be using these BC or the occasional deep day in a resort then I'd go for a fully reverse cambered ski. If you're going to use them in a resort, go for a ski with some camber underfoot. I'd also go really wide. I've never been skiing powder and wished I was using a narrower ski.
I was looking at the Hell Bents too as I want a ski for landing switch into pow and I want/need all the float I can get (I weigh around 210lbs/95kg). I was also thinking about the Volkl chopstick (I've always liked Volkl's big skis and the power they have). But then I found these:
They look big, even next to my Kuros! They're Depth Hoars (by a company called skilogik). They've got some camber under foot and rocker in the tip and tail. I went with them because of their extra size and I liked the way they flexed in hand. The pretty beefy in the middle but soften up quite a lot in the tip and tail.
I'm hoping that the regular camber underfoot will make them manageable in a resort while the size and length should make landing switch in even the lightest pow possible, even for somebody of my size. Its a bit of a risk buying a ski without skiing it but I was sold when I picked up a pair.They amazingly light for their size (191cm, 143mm underfoot) despite a pretty traditional construction with a lot of hardwood (the joys and delights of a core wrapped in carbon fibre I guess).
I'll also admit to being a bit superficial as they look amazing in real life and that did make me want them really bad. You can't tell from the pic but the eyes are polished moter of pearl and the design isn't printed on, its made from different types of wood cut and fitted together to that pattern!
I haven't tried the other skis already mentioned so can't really comment on them. Heard good things about the Bibbys though.
Coreupt Richard Permin's seem a pretty good deal at 359Euros
Haven't tried them (or any Coreupts for that matter) so can't say if their any good. But they tick some boxes; rocker, fat, near symmetrical.
I reckon a pair of last seasons Volkl Chopsticks could probably be found at a reasonable price and I think they'd be great for what you want. This is what I was going to do before I saw the SkiLogiks.
Bluehouse skis has some sick pow skis this year. Their prices are unbeatable because they sell direct. Not quite sure how much it would be to ship but going with bluehouse you will save a lot of money and have money to spend on shipping. Check out their skis!