unless you really want a wide board I would stick with the SL you can probably get away with it. I wear size 11s on boards as narrow as 249 no real issues, a 264mm waist on the Legacy is pretty wide.
SL is available in 158 if you plan on doing some freestyle that would be a better size otherwise 161.
I'm also looking at SL or Legacy and am the same stats as the original poster (6'2, 180-185) that stays away from the park but hits natural features, enjoys groomers, etc. Comfortable on carving/bombing blues and moguls. Most of the time is spent in mid-atlantic/WV with at least 1 to 2 trips west a year (the 2 this year are Tahoe and Big Sky).
My boots are K2 T1 double BOAs in size 12. Are these too wide for an SL if my stance is duck with an avg width?
Any insight would be helpful before heading to the local shop to check the boots on each board.