I have two 2238B's (one European, one American), one 2275, and three 2285B. All European models. The 2285B's are recapped to Selmic II caps in the sound path, and the others are to Nichicons. To my ear the 2285B's sounds absolutely the best. The 2275 would be the next in line, although very different in presentation; thicker but not fuller. I also had 2265B, sold at the first opportunity. It is a nice receiver but not as good as the 2285B are.
Could not tell about the other ones, since I never had them in the same room connected to the same speakers.
-sg