I can verify for you guys that the $450. Dodd pre-amp that I have posted info on in my forum is indeed the same circuitry as used in the $3,900. Melos 333.
It does use higher quality parts and has been made in a way that should make it more reliable.
What it lacks is the fancy chassis and features like balance control, less inputs, no phono stage, or head phone jack, etc.
It sounds every bit as good as the Melos, but is blown away by Gary's reference series pre-amps, but they're not $450. either.