I'd sell and buy in two separate transactions. By attempting to trade only, you limit your market to those who meet all of the following condones: 1) want what you have, 2) have what you want, 3) and are willing to make the trade (with or without concessions). Going about the process into two separate transactions greatly increases your ability to move your goods, as the purchaser only has to have currency (not a desired commodity). Plus, you open your options to acquire product other than what may be offered in a trade.
Bottom line - I'd sell the pre and power amp and then take those dollars to the used market to get the integrated you want (rather than settle for what may be offered).
Bottom line - I'd sell the pre and power amp and then take those dollars to the used market to get the integrated you want (rather than settle for what may be offered).