Whoa, you want $17K for this?!!? So you're essentially trying to recover your Aug kit cost 3 months down the line. Nice try!

This kit will mine 12.37 btc per month at the current difficulty; and this is assuming the kit can be overclocked to reach 500 GH. At 400 bare minimum GH it will produce 9.9 btc. So I'd say if I made an offer it would be in that range.