Good luck with the Jag! I have come the opposite direction. Bought a 2003 X350 4.2 which was immaculate. Only later did I find aluminium corrosion all over the boot front edge, c pillars and bonnet edge.
Had owned two Audis (a8 and S8) without any corrosion issues, so this was a surprise. Turns out the jag forums have jags inability to build the early Ali bodies correctly well documented.
Car was 2 months outside body warranty. Local dealer not interested, jag customer services weren't interested so I was stuffed.
Final straw was when the car broke down twice when it's Canbus wiring failed giving me multiple system failures (abs, air suspension, gearbox etc) and stranding me twice. This on a 78k car with full JSH.
Decided that those who said Lexus were uber reliable should be listened to- so gs430 it is.