I just built a new printer with the leftover i3 frame from my i3v upgrade. With the original MakerFarm motors (circa March 2014), it rattled and buzzed its way through the prints, and this was why I upgraded. With the new build, though, I used these motors:

http://www.robotdigg.com/product/206...-Stepper-Motor

I'm driving them with StepSticks at 50%, which I think is about .5A. They just sing quietly and all the vibration in the frame is gone. Sometimes I walk into the room and think the printer has stopped, because I don't hear the printing over the power supply fan.

You can also reduce noise significantly by isolating the printer from the table surface with these:

http://www.thingiverse.com/thing:322915