Forgive me for I am a newbie, but can someone here tell me what the specific differences between the i/Ci/CSi models are? Also I seem to recall that the CSi was available only for a short time, could you also tell me the years the different models were available. If this information is too long to post here, please tell me where to find it. I have wanted an 850 since I first saw a black one on the cover of Car&Driver (while in high school) with the caption "Mr. Vader, your car is ready".