I just received the recent edition of Keith Martin's Sports Car Market magazine. Along with the magazine was the 2010 Pocket Price Guide. I was a bit (pleasantly) surprised to find that they list the 230/250/280 SL in their Buy-Sell-Hold section as a Hold ("If you already have one, keep it, its on an upward trend". The 113's were listed again in another section about "9 Blue Chip Collectibles - The European Perspective", with a subtitle - "These cars should make you feel great when you drive them, and they'll look good on you too."
Nice to read some of the positive stuff about the Pagoda.