AVM uses MOSFETs in teir output stage and I would agree, it imparts a warm, sweet sound. It is part of the reason I am such a huge fan of AVM.
They have the A30.3 integrated amp available which $4495 list and has an aburd feature SET. The only thing it lacks is a built in streamer and should be on your list of considered devices.
I have the MA30.3 monos here (though currently off at a customer) and they really are awesome with the right preamp stage which is obviously incorporated into their integrated.