Unless your groomers are really long, really wide, and really fast I'd suggest you stick with what Gustov recommended. The SL kills groomers I might add. Maybe even the Heritage. The other boards are for terrain more challenging than groomers.
Keep an eye on the cobra which is made for much more than just groomers but if you ever travel or get a powder day, it might be the ticket
I've bought into the forum hype and have only ridden Never Summers (they sure are durable) mainly, so can't recommend other brands too much but they are out there as well.