+1 for the SL over the legacy and the 158.
You might need boots with a reduced footprint but most have that now.
Also If you get to ride tons of deep pow the 161 would be better. If powder is more an occasional thing and its 30cm or so the 158 will be ideal.
I am 175 and I ride a 157 proto in 40cm or so of powder with no problems.
Thing with powder is the more skill and experience you have the shorter you can ride.