which tow estate car for a Unicorn Valencia 1545kg

I have just joined the caravan fraternity and have bought a Bailey Unicorn Valencia (2011) with MLTP 1545. Currently have a BMW 320d (2010) but am renewing car for estate and cannot find aything suggesting the best car for the job - i am looking to buy new 2013 and would appreciate your collective expetise.

I am looking at Toyota Avensis, Seat Exeo ST, VW Passat,BMW3 tourer, Mercedes C220, Vauxhall insignia, Honda Accord - but uts a minefield.

Thanks in anticipation