Mostly I hike in Pata Baggies or my Melanzana skirt – so I guess that's my top 2.
I love my Houdini pants. So that's 3.
4 and 5 would have to be Arcteryx Parapet (the dead bird really does make a killer pair of pants, though the price of admission is high!) and Ex Officio Nomad (I'd almost given up on these but they now offer women's size 2 with a 32" inseam–I've only found them on the Ex Officio website). They're the only hiking pants that have survived lots of miles and numerous churns. The Nomads are a little ugly but so functional; the Parapets actually look decent and are wonderfully free of cargo pockets, so they are mostly reserved for dayhikes or trips where I'll be doing a mix of hiking and front-country travel.
I keep trying to like Prana hiking pants (their yoga pants are great), but they just fall apart so fast, I've given up. I used to like Patagonia Rock Guides, but the new ones (Rock Craft, I think?) fit me terribly. They seem to be following the thick-waist / skinny-thigh trend that plagues a lot of women's "fashion" clothing.
ETA: I would mention my Mountain Khaki Alpine Utility pants but if I list something made of 10-oz cotton canvas I might get some stones thrown at me. This is BPL and all. They're great for bushwhacking though!