Not familiar with the Heads but the Elan Waveflex could be a decent choice for you in the East.
At this point in your career, you should have an idea of what kind of skier you would like to become. From your post you indicated you are getting into some trees. That means you are venturing off piste and learning how to ski variable conditions. As an advanced intermediate skier you would benefit from a ski that is more "all mountain" oriented in the 78-88 waist width. At your ability level I would be careful and not go too wide (90+) as a wider ski may mask some technique issues as you learn.
With that being said I would consider looking at the Rossi Experience 78, 83 or 88. The Blizzard Magnum 76, 8.1 or Bushwacker. Volkl RTM 77, 80 or 84. It would be really helpful for you to try and demo a few different types of skis so when you talk to a shop rep, you can tell him what ski you have tried and what you have liked as well as describing what you can do, what you would like to do and what you realistically can do on skis. Armed with that info any good shop rep will be able to put you into something appropriate for you.
Finally, save a few bucks for a coupld of lessons after your purchase to help you get the most out of your new skis.
Good luck, and Happy New Years.
PS All of that is said assuming your current boots are up to snuff.