I'm notorius for buying new stuff and not getting rid of the old (and I'm not alone.....right, Russ  

).  One thing I truly do admire Donny and Fran for is not accumulating 'crap'.  For instance, at the moment I need (want) to upgrade my VP-550 to a VP-770 (in one fell swoop, they included every new feature I ever wanted in the old one).  Clearly, in the case of such a specialized instrument, I don't need to keep the old one, but what is the best way to handle this; private sale, trade-in, etc.  Which outfits have the best record for fair trade-ins?  Is every transaction unique?  Is there a list of trade-in values?  What's the best place to sell privately?  Is it worth it to get an experienced seller (like, say, Fran or Donny - seriously) to sell it for me?  Please help.  I can't afford to keep accumulating all this stuff and stay married at the same time.
chas
PS:  Anybody interest in a VP-550 (I might throw in a Tyros2 as an incentive  

).