If you're getting out of the game or upgrading to r9 Nano's I'm in the market for 7950's or 280x's. I recently purchased fully functional 6 7950 rigs for $1,000 each. So that'll give you an idea of the price per mh/s that I'm looking for.
If the deal is right - I have about $12,000 I could put behind this.
Where are you located? I am considering selling 5 MSI R9 390 Cards and upgrading them to Nanos since power cost is too high here in SoCal. They are less than a month old with boxes and receipts. If interested, please post or pm your offer.
Edit: pic of the rig.