I could throw out some numbers but you might be insulted.  A good starting point is to just look at Ebay or craigslist to see what folks are asking.  People on these forums are looking for a good deal.. of course.  Just look in the hardware goods forum on these bitcointalk.org forums and you'll also see what the marketplace is like.  Escrow is just where someone holds your funds until the buyer is satisfied.  So, if you had a buyer on these forums then that buyer would send funds to an agreed upon 3rd party (also a member from these forums) escrow and then when the buyer received/tested the goods he would release the escrow and you get paid.  So there's always tradeoffs: ebay = selling fees and forums = escrow and delays in payment.  I've gotten really good deals in these forums.  Just comes down to what you're looking for.  If you're trying to recoup money on your rig then these forums may not be optimal and a local sale may even be better.  Just depends on what you are trying to accomplish.