For the board style, I would want to put you on either a hybrid (blends good features of camber and rocker) or a camber board. Camber is the traditional shape board designed for more performance/more precise turning and pop. They are not as playful as a Hybrid or a Rocker but it all depends on the person.
Since you love speed, you will need a stiffer board so there won't be much chatter at higher speeds. The stiffer board will be much easier to control down the mountain but in a park they will not be nearly as fun just because they are so harder to flex.
All of these boards are great for charging the mountain at high speeds and are on the stiffer side so they won't have much chatter but will not be ideal in a park. It seems like you aren't nearly as concerned about the park so they would be fine.
Rossignol One MagTek - magne-traction helps to carve in icy/hard packed conditions (lots of people tell us that once they try a board with this they will never ride a board with out it, hybrid rocker
Ride Machete - hybrid rocker, long flat spot throughout the center for stability and rocker on tip and tail for more float/harder to catch an edge, has won awards in recent years for being an amazing moutain board
Burton Custom - full camber board, amazing all around board, i believe the most popular board of all time, can handle higher speeds well
Hope this helps a little more!