IMO,
Leave it for 5 days and then open an unpaid case against him, if he dont pay you will get all your sellers fee's back, he gets a black mark and he also can't leave you neg feedback.
Only issue is you don't what to offer a second chance - just in case he decides to pay and then you could leave yourself open to not having the item to sell & then neg feedback.
Take him straight to ebay court or second chance it as said and leave him with bad feedback
As a seller your not allowed to leave neg feedback....