Have you been at all happy with what you've been wearing to date? Are you looking at trail runners or do you still need the ankle support?
It's been 4-5 years now that I'd discovered how well trail runners work for me. But I've been lucky with strong, flexible ankles and good knees. I'd picked up good deals, twice now, on NorthFace Ultra 100 and then 102 (not necessarily recommending those). I've been waiting to retire the 102's and finally picked up a pair of INOV-8 Terroc 330. I don't hear mention of this, but one of my biggest criteria was that the mid-sole/arch-support not be made of smooth plastic, as some runners are designed, but made from the same rubber material as the rest of the tread. When bouldering and moving across rocks, I transfer weight right into that part of my foot and that plastic mid-sole slips immediately.
The Terrocs shipped for around $70 (see Gear Deals). I haven't yet put the miles on 'em but have been trail running and I'm very impressed. They're responsive to terrain without transferring too much shock. The cleat has really good grip in dirt and on rocks. The lacing makes for a snug fit along the entire length of the foot. I'm considering inserts on these, sizing was odd, and I had to size up by .5, but I'm imagining that good inserts could only help with longer distances.
They look cool too!
Anyway, that's my CO2. Good luck!
-Michael