If you prefer the D240 with the Electras, I would negotiate the best possible deal to buy the D240 outright from your dealer. Then, you can sell your 100.2 on Audiogon and probably put money in your pocket.
Dealers are notorious for giving very low value on trades. You have to remember that they pay wholesale for new stuff, so why would they give you market value for used gear - especially if you aren't buying something new and way more expensive.
I don't want to be a dealer apologist. However, it seems like this dealer spent a good amount of time with you and gave you the sound that you were seeking. That doesn't mean you have to accept a bad financial deal, but I would haggle with him and/or try the option I suggested.
Dealers are notorious for giving very low value on trades. You have to remember that they pay wholesale for new stuff, so why would they give you market value for used gear - especially if you aren't buying something new and way more expensive.
I don't want to be a dealer apologist. However, it seems like this dealer spent a good amount of time with you and gave you the sound that you were seeking. That doesn't mean you have to accept a bad financial deal, but I would haggle with him and/or try the option I suggested.