well i have a 07 madone 5.2 sl, which i bought a month ago for 2699.99. I thought that was perfect and dint need to be redone. I currently weigh about 213 and its a pretty good ride and i pass "out fitted" bikers and kept up with a guy who had a cervelo soloist carbon and was in very good shape (friends now). I do not know about the 08.
this is the exact bike i have, mine might be a bit bigger (58cm)
bikeworldiowa.commadone52slred.JPGOpen ↗
when i open up large images of both bikes, the only thing that looks different to me is the top tube and bottom tube of the frame. They seem to be shaped more in a more arrow design. The 08 madone sl pro im guessing will be listed at around 3500, but im not sure. Is the top tube and bottom tube more arrow worth an extra 1,000 dollars? With that price range of 3500, i would shift from the madone and look at the cervelo R3. Thats just my opinion, the reason i bought the 07 madone knowing the 08's were coming out was the price, 2700 for a full carbon frame+fork and some good tires and components, it was like a gift from god 😄.