When I had my N803s the cables I liked were Acoustic Zen Hologram and Satori, Audience AU24, Purist Aqueous 20th Anniversary. The Acoustic Zen cables are very good though and can be had used way under your $2000 budget and highly recommended with the B&Ws
Also I second the Canare 4S11 as a cheaper option. Just get good quality connectors if you go that route