From E500 (w211) to XJR (x308) ???

Servus together, I drive an E500 and think about selling this possibly and switching to an XJR X308 because I like the look very much. An x350 does not come into question, because it seems to me already too massive and by far not as sporty as the x308. If then I would decide for a model from year 2000 with under 125tkm. What do you think of such a plan? Totally crazy or ok? What must you pay attention to with the x308? – what are weak points? en? Spare parts situation ect. I know of my XJS that some spare parts are very difficult to obtain and by way of detours, as it no longer supplies jaguar. Is this similar to the x308? What is a justified price for a well-preserved xjr from bj 2000?