well first of do u mean 08 seths or the 09 obSETHs? the 09s are a lot different, wider and with more rocker in the tip (early rise- whatever u want to call it). if ur on the ice coast i'd go with the 08s.
the 08s are fairly stiff, but at 180 lbs u'll be fine with them. definitely don't mount them core center, because they're really not made to be mounted there and they won't perform as well. u can mount them at the farthest forward recommended point though.
seems to me though if u want to have a centermounted allmountain/park ski u should check out the kung fujas. the waist is almost 100 and they're designed to be mounted farther up than the seths
a friend of mine from new england was driving through georgia on a road trip and he ends up getting pulled over for speeding. the cop goes "son you were goin 80 in a 60. no one goes that fast through georgia." my friend responds with "well, Sherman did"
he ended up spending the night in jail