Sorry but your pricing is way to high.

Your rig would make a maximum of 35$/Day (not including electricity) and that's mining the most profitable coin from coinwarz (right now).

It would take at BEST 88 days to break even.

Just to put it in perspective, these are used items, their value as per your post is worth MORE then the current new price? I'm confused.

I'd be willing to take the 4x cards, through escrow at USD$205/Each. I doubt you'll find any better offers for used cards and that's even assuming they can hash anymore.