best way to sell a portofino

Hi. Just looking for advice as to the best way to sell my Portofino Hand-Wound Eight Days...REF# 510103. I am looking to purchase the new BIG PILOT and was thinking Tourneau would give me the most money towards a trade. Rather use my local IWC dealer, but they only are offering $3700. It is in great shape and I have a brand new strap. Is EBAY the way to go? Any thoughts would be appreciated. And no I can't have both watches! Not at this point anyway!