If loyalty is not an issue, then we should be looking to offload the some of the 28 yr old brigade to solve our problems, not looking at the 22-25 players. I really doubt that we'll fetch much for the likes of McVeigh or Demspter. If loyalty is out of the equation, my top candidate is Jude - he's on a downhill spiral, is obviously struggling with his hands (he used to be a superb mark for his size) but would still be valuable especially to young teams that needs hardness and leadership in the middle - say Richmond or Carlton, maybe even even Melbourne (if McLean is injury-prone). But again, we wouldn't get good value from him, maybe a third round and a second round if we're lucky.
But I don't see that we'll get any better offers for the 'younger' brigade that's more than valuable in our future transition beyond 2009 then the likes of Fosdike, Matthews, Crouch etc. But Bolton has been very loyal to us and in my mind, shouldn't trade him. But nor should we with McVeigh or Demspter, simply because we're not going to get anything useful in return, nor does it solve our ageing problem.
Buchanan is probably the only one with trade value, but he's far too valuable for us and we will not recoup anything close to his value to us (especially after a down season).