Dj controller usb in?

ok i plan on DJing here pretty soon and im looking for somkinda of device that i can just use to stream songs from an external hard drive and i need this device to run into my 24 channel mackie mixer that i run my pa from preferbly either either xlr, 1/4 or rca out would be fine and im trying to be another product that i found for 329.99 and obviously i dont need anything with a built in mixer since i have one