i have this set and it works fine: http://www.benl.ebay.be/itm/18084063...84.m1423.l2649
it's 1 controller with 3 seperate motor driverd and the cheapest price/quality i was able to get.
you can also go for the Probotix controllers: Stepper Motor Drivers
it's a bit the same.. (also in price i think) they also sell a controller with 3 seperate drivers.
i have also hear alot of good about the Gecko G540 but i find it a bit to expensive, it's just what your budget alows G540 4-Axis Motor Control