Nice leopard skin box.
Seriously though, you gotta sell it like an econo car... stereos aren't part of that market. You can probably get some scrilla for the audio gear on eBay or something.
And remember, to sell fast, you may have to be willing to take the hit and sell it at a loss. Thing about this... if it will eventually sell at the price it's at, but cost you 4 more payments, plus registration, plus insurance... won't you save money by unloading it at a $1000 loss now? Drop the asking price $2000 and watch it go next week, perhaps?