I've always enjoyed instruments that reach below the bass clef, preferably way below.
Bassoon is fun, but contrabassoon is much more fun.
Please also feel free to join the Contrabass email list , currently available in regular or digest formats. Consider it the contrabass mania online support group. If you're looking for a musician to cover some unusual woodwind parts, try me . The ORSI musical instrument factory, where contrabass saxophones and sarrusophones are still manufactured. You may also be interested in the Galpin Society , and in WindWorld .