If I had the money to buy and up keep a Jag it would be a series 1 E Type love them. But the only XJ6 Jags that are reliable are when Ford took over operations. The 94-97 models with the 3.6 and 4 litre are about the pick out of them. Joe Cartwrights write up on the later XJ6's but two many problems with the earlier ones.
http://ninemsn.carpoint.com.au/car-review/2575334.aspx