I was lucky when I bought my Stumpjumper recently; the lbs bought back the hydraulic brakes for a decent price so I could put my 2-year old Avids on it. The hydraulics were not impressive to me, but it was only in the parking lot.
I ride in the Georgia/Tennessee mountains and sometimes in Moab. I just don't need better braking, modulation, etc. The big advantage is the lack of maintenance an the simple adjustments of the Avids. I've read and have discussed with several bike mechanics, who happen to be friends, the maintenance and repair issues with hydraulics. Not for me, thanks.
By the way, you can't beat the Avid adjustable pull levers either. You can dial in the sensitivity to suit what you like.
About four monthes ago I bought a set of Avids to complete converting my wife's bike. They were $45.00 plus shipping.
Al