The 200 Tanker (with Catek Freeride pros) is one of my favorite boards so it gets lots of use, mostly making long slow turns at high speeds leaving long trenches behind me. Once you get past the fact that it's 200cm. long it rides like any other board but it's happiest on an empty run where you can enjoy it's speed. It's not a very stiff board so you can ride it all day without wearing yourself out and it does a great job of making making bumps seem to disappear. I also have a 187 Wide Tanker Heli-Cat that I really like but it doesn't get used as much. For more info on Tankers check the Bomberonline forums, it's mostly hardbooters but everyone there has an appreciation for Tankers.
Sidecut makes a big difference in how a board rides, most powder boards have a longer sidecut to allow slower surfier turns, Park boards have a tighter radius.
Swallowtails are another great option in powder, I think I ride them as much as conventional boards.