So 5-6k it is then.
That would be £3k for a nice low mileage L322 and £3k for the inevitable repairs. That's a good place to be in.
Or I highly recommend any low mileage Jag with the AJ8 engine, although make sure it is sound as they rust like crazy. You only need £500 for possible issues on the Jag so can spend more. That will cover the plugs and coil over plug thingies.