Hello!
If money is not an issue: A Seneca V. But not one of those that are downgraded to 1999kg to avoid Eurocontrol route charges as this leaves almost no margin for payload and fuel. The V has good performance (speed and range) and more modern avionics and instruments than the other ones.
If money is a factor: A Seneca II with turbochargers. Nicest handling of all Senecas (although still very unpleasant compared to any other aircraft I have come across), good short field performance and good payload.