imtim,

Is the Nishiki Altron a road bike? (never heard of that one, did Nishiki even make mtn bikes?). Do you have a certain budget for your ss project?

A ss or fixed specific, or flip-flop rear hub can be expensive, and having a wheel built with it can be expensive too since even if the bike shop uses the rim you already have they will insist on using new spokes so they can guarantee the build (well, you would want to get the correct length spokes anyway).