Just get your LBS or this guy (http://www.pinkbike.com/buysell/1364408/) build you a wheel on WI eccentric hub. I had Dave (pinkbike link) build be one for my MTB - run it fixed on gnarliest trails and it rocks. My mtb is old cannondale frame with vertical drop outs which I like a lot and I wanted to run it fixed so eno hub was perfect solution. I have freewheel (splurged for WI as well - bombproof and engagement is second only to fixed) on it just in case but 99% of the time it is on fixed side: