Hey,
Thought I'd put my 2 cents in, have a look at the cannondale prophets. I race in enduros & epics at every opportunity & have found this ride to be nibble enough for the climbing & perfect for the decents. I'm only riding a base model with a rear shock upgrade to include SPV & that bike set me back a total of $2800 + the bike is also good fun for general trail use with the lads.
Bike Spec:
Cannondale Prophet 600- race red clean frame except for sponsors stickers
Lefty Max Fluid Flow front shock
Manitou 3way swinger rear shock
avid BB7 cable disc brakes with avid levers
mavic rims & cannondale hubs
specialized BG comp saddle (very important for enduros)
Maxxis Larsen TT 2.0 tyres F/R or IRC Trailbear 2.25 pending on track
Yuri grips/Yuri lock-on grips (also very important)
Truvativ Cranks pending on the track may remove granny gear
Shimano running gear LX/XT
As you can see not the lightest rig but very enjoyable & comfortable to ride.
Really get on some bikes & ride every bike is different & what works for 1 may not be right for another. Most importantly spend a bit of time reserching your bike, its geometry & especially the contact points, saddle, pedals & bars/grips get this right & you'll be smiling to the wee hours of the morning.
Good Luck
Hopefully pass you in a enduro or 2