So I currently have a 10-11 NS SL in a 158. Great board, but looking to change it up and try something new. I'm 5'9 200 lbs(target weight by the season start is 185) and wear a 8.5 boot. I've got a pair of 10-11 Burton Rulers and 10-11 32 Ultra Lights.
The SL was my first board, I only get to ride 5-10 days a year normally, so I would rent in the past. I finally said fuck these abused rentals and got my own setup. I'm looking to try and get up to maybe 20 days a year if I can get away long enough.
History, started on skis at the age of 3 (again only 5 days or so a year) had no problem riding advanced terrain at the age of 6 and by 10 was able to hit anything in bounds for the most part. Switched to a board at 12 and development was slower there. I'm 28 now (didn't ride for 9 years) and I ride mainly groomers blues with some single blacks(I know that varies resort to resort, but yea). I like to go between the trees and do some mild off piste stuff (no huge kickers or anything) just playing in the pow with some smaller jumps.
So on to the board dilemma. I'm looking at a NS Cobra 158, Lib Tech TRS 159, Gnu Billy Goat 159. Those are the top 3, the billy goat was really attractive with the slightly narrower waist with my 8.5 boots. I've also considered a few other boards, Bataleon's the Jam, Bataleon Goliath, and Capita BSOD.
Whichever board I buy, I plan on pairing it up with a pair of Rome Targas.
All good boards but none really the first choice for what you are describing.
TRS is probably closest, but might be a touch wide - but 159 (assuming you get your weight under control) might just work for you at 25.3.
Cobra could also be ok but would be more limiting if you are planning to ride switch.
Billy Goat not the right board for the described riding - it is much more of a big mountain charging board. It will work ok on the groomers but is too stiff and plankish to be much fun there.
Of the other boards, the Bataleon Goliath is not a bad choice.
The Jam is way too much board again (like the Billy Goat). Have not ridden the BSOD but assume the same applies.
To be honest, the SL is pretty damn good board for your type of riding. The Proto would be good, too.