I'm looking to get a new pair of skis before the season really gets underway, and would really appreciate a little advice from some folks who know a lot more than I do (which would basically be anyone here). Some quick background:
I'm 6' 0", about 140 lbs, 25 years old. I've been skiing in Montana for about 8-10 years now, but only about five days a year. I'd consider myself on the higher end of intermediate, and I prefer some powder, trees, and off-piste, although I also do plenty of groomed and the occasional bumps. I've only owned one pair of skis that whole time (probably time for a new set, huh?), and they're straight-as-a-rail Rossignols at 185 cm, although to be honest I don't even know the model, as it's not printed on the skis themselves in any obvious way and I knew literally nothing about skis when I bought them. They've treated me well, but it's time to move on.
I'm looking for an all-mountain ski that will handle most conditions well, as I can't really afford to own more than one pair. I got to try a pair of Line Prophet 90s in 179 yesterday, and liked them a lot (although to be fair, everything I tried was pretty interesting since I've been using the same set of skis for eight years now). I'm thinking of going in this direction, but still have a few questions.
I've read in other threads here that the Prophets ski shorter than they really are because they're twins. Would 172s be too short for me? I don't think there would be a problem with 179s, but I'd like to lean on the short side of things if I can.
I saw a pair yesterday that had a set of Head Mojo 15 bindings mounted to a 13mm riser plate. I don't know much of anything about plates, and I'm still a bit confused after reading through a few threads here. What are the advantages/disadvantages to the plates? I've seen a few comments about them giving better grip while carving on groomers, but is it enough to be noticeable? Would they make sense on the Prophets, which sound like they're a bit weaker on the groomed stuff? Any downsides to be aware of?
Anything else in general that I should know/consider/ask before I take the plunge?