K2 makes quality boards, and if you are riding more all mountain, without very much park, then I'd say go with the Duchess or a Luna over the Fling. The only thing I will say is that the smallest size the Duchess comes in is 144, and at 5'1 135lbs, it might be a little big for you, at least as a newer rider, but if you picked it up fairly well last year then 144 might be fine, but I wouldn't go any longer than that unless you were hitting some pow. The Luna and the Fling however, comes in 142, both of which are going to be a little easier to ride and have a little more control, especially if you're only into your second season.
So that being said, the Fling does also come in some of those smaller sizes and is in your list there....and if you don't really plan on going out west or anywhere crazy, then you will be able to ride all mountain with it because all mountain around the east is no big deal and you can do it with just about anything. So the fact that it is more a freestyle driven board isn't going to matter too much, its one of their do-anythings, for women and leaves room for progression as you develop as a rider. Plus it got Good Wood!
You're in the DC area? We carry K2 and a ton of other women's boards at my shop in Fairfax if you want to come take a look at some of those boards and maybe I can help you find a board in person.
Last edited by playbass311; 10-05-2008 at 09:38 AM.