Welcome to the club, Jeff,
The x type has quite few engines in its car, and a lot depends on what you want to do with an estate.
I had an X Type saloon which had a 2.5 litre Petrol AWD engine with a manual gearbox. A very enjoyable and roomy car and held the road like glue.
My son has a Jaguar estate with the 2,0 diesel engine which is very reliable although I do find it rather noisy. The 2.2 diesel engine is quieter.
In these times of demonising diesels I would think about a petrol engine even though I have a remarkably quiet 2.7 diesel s type!
Regards,
Peter.