What skis should i get?

I would go with the Volkl Bridge skis if I were in your situation. As the name implies they are the "bridge" between big mountain skiing and park skiing. Check out a review here: http://www.sierradescents.com/reviews/skis/volkl/bridge.html

the best resource i know to get info on skis is ski mag(canada), and they happen to have a website featuring a ski finder option, here's the link... http://skicanadamag.com/ski-finder if you're going to start doing jumps, i would recommend twin tips, but they're no good for all-mountain. its really about wether you want to start doing jumps or keep skiing on trails... one thing that can help is to rent or borrow one of your friend's twin tips for a day, to see if you like it enough to sacrifice the performance on trails and invest in park.

It all depends on what style you like and how wide you want them. You do not need twin tips to land tricks backwards however it helps alot. If you do 70% non-terrain park skiing you should look for more all-mountain skis instead of just skis for the terrain park. Here's a graph for the height/size you need. http://blog.sunandski.com/?p=169

Lines, armadas, 2ks are the brands that are the most well known to me. I ride lines but armadas are great too, if you look at the skis on their websites it will say how good they are on each type of trail. For line I would say Line blends I wish i has gotten those they are good for everything but pricey. For armada I wouldn't know for their all mountain skis but line and armada only make twin tips.