The leather can be refurbished by a good upholstery place or mobile repair people, they fill the cracks with like material and re dye the colour.
Talk to Voldat in Moorabbin, Berry Motor Group in Mitcham, Mason's Prestige in Seaford, they all have customers with these cars and will know who is selling. You get a good service history of they have done the work.
Have you considered a V60?
A little bigger and much more modern.
I drive a v50 and get back into my V60 and it's night and day a much better car.