You were in the exact same position i was in uncanny really since where the same height and weight. I spent a couple of months at red mountain, which has the best trees in north america and already had the magfire 10 in a 160 but was looking for something a bit longer and fatter with a true twiptip. Then I made a really foolish decision, i bought a pair of 05 1080's without demoing as the price was to good to pass up. I found them way to soft and thier speed limit is slow as, i skied them for about 5 days before i sold them worst ski i've ever been on.
After this I had the opportunity to try the k2 seth vicious and the ARV by armada and if you want something with a waist around 90mm the the ARV is awesome. It's got nice thick edges, and is just a really solid ski. I'm reasonably agressive and loved it everywhere, the magfires where my favourite if it wanted to rip the groomers for a couple of hours, but if i wanted to do anything else i'd slap on the ARV's. I had them in 175cm as well.
oh better mention that i was trying to tell you in a round about way to demo the skis first, it'll save you a lot of time and wasted ski days on crap skis.