Arduino and labview

I would like to use arduino for control of dc and step-motors. My application for control of the motors will be written in labview with buttons for speed and direction motors control. Therefore my arduino has to be connected to PC via USB. Could you please suggest me the suitable arduino with USB interface? Could you please give me an advise what kind of a softwre for arduino I have to buy for using it with labview as an interface for control via USB.