So a good powder board isn't just a matter of getting a larger board?
What qualities in a board makes it a good powder board? Size, RC or Traditional etc....?
Really depends on your riding style in pow. The Charlie, one of the two CAPiTA's I still support, is directional rocker and tapered. So you will float super easy your natural direction but switch will be harder than average.
I prefer twins and directional twins unless I will literally only be riding 3ft deep all day. For in-bounds powder I find twins and dir-twins more useful.
In that case, look at a 159 Signal Omni, 157 Arbor Coda (full rocker allows the slightly smaller size), Similarly sized Flow Drifter, Nitro Team Gullwing, K2 Happy Hour, 2010 CAPiTA Indoor FK's are a blast in pow but kinda meh everywhere else (if you find one for cheap...), Forum Destroyer Doubledog, Burton Sherlock is seriously made for powder funtimes in-bounds, or a Bataleon Goliath. All around 157-161. More rocker means you can ride smaller if you wish, camber/rocker combos shoot for the middle sizes, and camber shoot for the upper end.
If you get the Omni, your board was made starting from 2x6's to the finished product 6 hours from your new home.