A guy at the LBS has his 4.0 and his wife's 3.0 for sale. Both appear to be 2006 models with about 500-700 miles on the computer. He is asking $600 for the 3.0 and $1500 for the 4.0. The 3.0 sounds pretty good, but the $1500 seems a little steep. Should I jump all over the 3.0??