I think the RCA cable will work for Digital, but if you're concerned about it you can check online music shops for Sp/DIF cables. Honestly, though..... they'll probably just charge a lot of money for little noticeable difference in quality.
And yes, standard A-B USB cable. Just be warned ahead of time..... be VERY careful when plugging and unplugging the USB from the CDJ-2000. There are many reports of users with broken ports.