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if you are building your own case and adding power I recommend the befaco excalibus power supplies as very good - 1 per 6u works well and they are very quiet - no noticable ripple up into video rates (MHz, not just KHz for audio), no rackwart, equal -ve and +ve rails and available DIY - a simple if tedious build (due to the number of headers that need soldering) - & low form factor - all headers are on the edges, not upright

Steppermotor provides a variety of different types of gear reducers including planetary reducers, parallel shaft reducers, and worm reducers.