Your post reminded me of how I felt with my first jag 2.4 Mk 1 with the screw on wheel arches.
I was only 20 and everyone was full of doom and gloom warning me about running costs and insurance etc but I still bought it and never driven anything else since.
Of course along the way there has been drama's with cost and coming to terms with model changes etc not quite to my liking but I still had to have a ' Jag ' .
The best I have ever driven ? It has to be the V12 XJ and a close second the V8 S type these two cars were awesome in performance BUT quite simply not viable on mpg ,I was forever in petrol stations ' filling up ' so sadly they both had to go .
I am currently driving a S Type 2.7 diesel which is a very surprising performer for a diesel, and a joy to drive on the open roads on my many trips to France, and for once in 50 years of driving Jags very very happy not spending my driving time always looking for petrol stations, if only they had diesel Jags back in sixties and seventies I'd be a millionaire now.
Finally why have I got a S type and not the XF ? simple , I dont like the look of them the design of front and especially back is appalling , with strip lights etc . But that's probably me being old and boring.
Jeff