Ok, I am looking at an 80-200/2.8 to add to my collection. KEH has both the D version as well as the AF-S. Both are $751. However, the AF-S version is rated Bargain and the D version is Excellent. Obviously there will be differences in the condition of the two. I have never bought from KEH but have heard repeatedly that they are very conservative with their ratings. My question is do I buy the D or AF-S. Is the AF-S an improved enough version to risk/warrant going with a Bargain rating? If you have owned one, or both, please throw your 2¢ at me. Thanks.