I've just got shut of my 3.0V6 cdti signum, it was a great car with tons of extras as standard, BUT, the engine suffers with a SCV (suction control valve) problem which can occur at any time, cost me over £1200 to get it replaced and the car never drove as nice after it had been messed with, also you'll find that the Vauxhall dealers won't know much about it. Have a look on www.vectra-c.com