i own an sfb, and i spent probably 4-5 days on a dente last year, and will be getting one this year.
i am 5'9" 140 and i ride the 184 bacon, which feels big. i have ridden the 178 bacon and could tell it was more manueverable in the tight tress(probably the size Line would put me on), but i was giving up some of the ability to jump it in deep snow. They carve exceptionally well on groomers, you just have to learn to get it on edge, which can be weird for a big ski. but make no mistake, they carve trenches if u want em to. Overall, the bacons are soft to medium flex, forgiving but sturdy enough. solid ski. would recommend them to anyone wanting to own one ski to do all.
the al dente is maybe the softest ski ive ever been on, but they are very sturdy and stable if u keep the edges engaged and the ski constantly flexing. i have ridden several days on 178 and a few runs on the 188. the 178 is fun, buttery, and would be an awesome park ski. i also did like it for all mountain, especailly in tight trees, but dont expect to charge on the short size, u will go over the bars. the big one would be a great all mountain ski, but u lose a lot of playfullness in the park if u arent a massive dude. so those are your choices as far sizing goes.
hope this helped