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Overall the 2000 XKR is a very solid vehicle. If buying the extended contract make sure it covers the electronic throttle body unit. The throttle has to be replaced as an assembly and is very expensive. Most waranty contracts that we deal with do not cover this. Also make sure that the electronic modules in the car are covered (ABS/DSC, and body/security modules). The electronics arE the weak spot on those vehicles.
There is the Jaguar dealer in Baton Rouge. As far as other repair shops you will need to ask them if they have experience with Jags. If they do not it will cost just as much if not more to have them repair your vehicle then the dealer.