I just bought the Atomic SX:9 boots from Claude Swonger of SkiNetSports.com. I haven't taken them up skiing yet but I can tell you that they're very wide. I haven't tried the Nordicas, but I tried the Tecnica Rival X9 HVL(High Volume Liner) in the same size. The Atomics were much wider.
I have a wide mid foot with a high instep and the 28.5 size Atomics fit me great. I usally skied on 29 or 30 size boots to find boot that had enough volume, especially over the instep.
I've read it's design for E/E+ widths. The fore foot is very wide. It's almost more room than I need there. The mid foot and instep are roomy. From the back of mid foot, the boot is just slighty wider than the normal Atomic boots. The buckles are pretty good. The buckles on the calf section were very adjustable, to accommidate big calves, I guess...
I really like these boots, they fit my feet great. I've always had problems with boots, but these are wide and have just enough room on the insteps to accommidate my feet. I didn't have to go up a size or two to find boots that fit, so they're controllable and snug, but without hurting.
If you're gonna go w/ these boots, I'd suggest getting a footbed. The ones that come the Atomic SX:9 are pretty flat. They're suppose to have a heating element which you can attach a seperatly sold battery pack. I had custom orthotics made, so my bootfitter took the Atomic footbed apart, they turned out to have a small heating element just on the front toe area, pretty weak.
Definitly give them a try. Finnally a boot to fit us guys w/ wide feet.