amplid syntax are basically a lighter version of antidogma, so they should be stiff and light enough
they come in 178, if you can have them for cheap (since they're kinda expensive) they could be a nice choice...
as for ar6 lenght, 176cm could be good for rails and jibbing while 181cm are maybe a bit lenghty for you (but better for bigger jumps and some powder, obviously)
from what i know antidogma are slightly stiffer than ar6, but yeah, they're both awesome skis...
it's wether you're looking for a ski to charge hard on and hit big kickers (stiff) or a more playful one to be at ease with jibbing on rails (soft)
anyway, they'd perform really good pretty everwhere
the dogma and syntax are much stiffer than the AR6. If you can get a good deal on a Syntax then take it, it's going to be the lightest and the lowest swing weight, it's stiffer than the AR6 or Alphas, so you wont have a problem on bigger jumps even though its smaller. Syntax is one of my "dream skis" (along with Alpha 1s and LTEs), I have dogmas now and they have VERY low swing weight so I can only imagine what the Syntax has.
~WAKIN' UP THE NEIGHBORHOOD TONIGHT!~
~I could carve off a jump so hard I'd come in forward and take off of it switch~