I second the recommendation to change your thread title to something more specific. The thread title is your sales pitch: you want to draw people in, not have them pass over it without noticing.
As to a specific answer, where are you located? Filling in your country would help with more relevant answers.
If you happen to be in the USA, then you might consider something like this:
http://www.harborfreight.com/router-speed-control-43060.htmlThe output by default is AC, but you could theoretically pass that through a bridge rectifier to get DC for your motor. Rectified mains won't get you all the way to 180 V, but 120 V should have the motor turning at a reasonable speed.