Skis ah the great quandary....
(added after wrote this drivel, read the last paragraph first :wink: )
I would like to suggest several things to consider. I have sold skis in shops and have seen the evolution of the ski over several iterations. They don't build them like they used to, good thing!
Firstly buy a ski that's ski within your ability. Hills are littered with terminal intermediates who insist on skiing the latest racing kit. A proper ski for your level will enhance your experience. That's why ski manufactures spend millions on developing different skis. (a ski sure doesn't care about the size of your own gear! Don't let testosterone rule your skiing too :mrgreen: Now if you want to discuss cars or motorbikes .. but that's another blog)
Secondly length of ski is related to your weight! A ski never knows how tall you are it has no feelings in that regard. A ski "knows" how much you weigh! The pressure you can exert due to gravity, acceleration, and centripetal force is what a ski "feels" The heavier you are increases "down" forces.
Supplementary to weight, skis feel forces, G's if you will. If you are a tank you will need a beefier ski, if your are a feather weight you should ski softer flexing ski.
Thirdly - Snow type. If you ski on harder snow a shorter ski will work and if you hack in fluff a longer ski - more surface area to float on. The length issue come into play here too the if the ski is wider it will float if narrow it will need to be longer to achieve the same float.
Forth - a mitigating fact is the width in ski design. Wider skis which have less shape (side cut) will not carve a turn on harder snow they ski a straighter line. The arc of the side cut will determine turn radius.
Fifth thing is construction - weight mass of ski titanium vs steel, Glass vs carbon fiber..
Sixth thing is longevity - wood vs foam core..
Seventh .. base type hardness (see also longevity)
Eighth .. edge construction cracked edges vs solids and various combinations
Ninth ... cap vs laminate construction
AH blah blah blah... I've got verbal runs just read my favourite ski reviews at this site. They are usually considered the last word on ski tests. Read the descriptions of each category to get the best feel for the ski type mentioned.
http://www.skicanadamag.com/Gear/home.html
PS I drive a stoopid VW Vanagon '85 vintage and ride an old BMW M/C 1987 K. Just thought I'd add that - see my first tip...)
So long dude... J.