ok man, from someone who works in a shop, builds thier own skis, and has a DEEP understanding of the dynamics of skiing.
for one, thanks for doin some background research of your own, and giving the proper info needed to set ya straight. so many kids come on here and the post consist of "what ski should i buy?"
anyway, your tall, and a pretty medium build. the one thing to remeber with twins, isalways go at least head high, because you loose effective edge with the tip in back, and th shortert noses makes them ride shorter also. for you, you should not be on anything shorter than 180. im 510, 154lbs and on 185s.
if your on a budget, last years gear is the way to go. yu can pretty much get shit at cost. i wouldnt recomend anything too soft. while they are fun to play on, i find them not only unstable, but they are very difficult to jump with. something with a nice mid with waist, 80-90, is good, cause its much more stable landing jumps.
as for my reccomndations, lets see.
05-06 Line Chronic wide, 187 -nice mid flexed ski, very durable, and light.
04-05 Line Eric Pollard pro model, 186 very similar to ^, super sick graphics
05-06 Dynastar Troublemaker, 182. a lil narrower, this ski rocks. very unique flex, killer on jumps and pipe
05-06 Salomon Foil, 182 or whatever, sick ski from salomon (as much of a contradiction as that is), everything above mentioned about it is why. light, lively, turny, and fat.
Atomic Stomp- last year, 183. stiff ski, SUPER light, very durable. if you can handle the stiff flex, they are amazing. fat too 88 waist
i would reccomend the STLs in 183, as they ride awesome, but frnt is a wierd company, the skis fall aprat, and the warrenty is untolerable. the AR5 is also not on my recomended list. its fairly heavy, not poppy, and generally they just feel dead. some people will argue this with thier life, but they are just not an impressive ski.
your better off goin old than new, as youll get wy nicer gear. if you DO wanna get this years stuff, go or it, but be prepaired to get lower end skis. it isnt weorth it.
also, jump on ebay, and buy a pair of Look/Rossi Pivot 12 bindings. (NOT THE PX SERIES!!!!) they are amazing, i dont even need to get into it. just realize that this binding blows the pants off all other stanodard, non race bindings, and it will make your life easier. if they have risers, do not mount them with the risers. also, my rec. i to get them mounted 2 cm back from true center (so if its a 180 ski, the midsole would be 92cm bck from the tip). i have found this position works the best on MOST skis. any other Qs feel free to ask.