My commuter rig is an old trek mountain bike that I've converted to fixed gear with an ENO hub/crankset. I am thinking about going geared for the winter. I have a rear wheel that I built last year and never used (found the eccentric wheel on craigslist around the same time), an SLX rear derailleur and an LX shifter. Looking for a wide range cassette so I can take the bike offroad a bit more often, but I'm hoping to keep my 42t chainring on. I'm willing to take the risk that the ENO ring can work with a 9 speed chain.
The best I've found is a shimano CS-HG61 (12-36) which I think would be more than enough, but if there's anything bigger available I'd like to know. Not interested in mods/adapters.