Ya, the Neversummer Summit is an awesome pow board. Especially if you are doing tree riding. It rides smaller than it is and turns on a dime. Prerequisites for tree riding. I am of course partial to the Summit as I own one that I use for backcountry riding.
In addition to the above mentioned boards from Wolfy, you might look at a rocker board. The K2 Gyrator is a very fun pow board. You have to stay pretty centered on it in firm conditions or you will get dumped. In pow, it excels and is a lot of fun. Other rocker boards would be good, but I would look at one that is designed for pow riding vs those that are more park oriented. Either will work but you'll get more out of pow designs.
Also, on the swallow tail/split tail designs. As far as I have seen they are still the best for true pow riding. You are a cruise missile on one of those and everyone will be trying to catch up. The drawbacks are that the split tail can get damaged fairly easily and these are pretty much pow specific boards. Firm, hardpack, icy conditions they just suck on them. Even with bc riding you will hit firm conditions. Out trails, luge runs, that sort of thing. You can do it, but it's just something to consider when getting a swallow tail. They are probably the most specialized of the pow boards.