£650 on a Rohloff wheel, a good few years ago.
I bought a pair of 2010 Magura Thors a couple of years ago. Cost me £225.
Sent them off for a £90 service a year later, found out the internals were mashed from being previously lubricated with engine oil. Cue £400 for replacement internals. The upside of that though is when the travel adjust failed, they were classed as new forks, so I got a brand new pair of the 2013 model under warranty
Selling, I sold my Singular Peregrine for about £900. Met the buyer in Scotch Corner service station car-park and swapped bike for a wad of cash.