Welcome to the site.
The Signum is a very well equipped car, for not a lot of money. My parents have had a couple of them, and they have been really good. The only issue with them is they are a 4 seater, and not 5 like the Vectra.
One I don't have a picture of was a 2.2 Elegence, which even had the fridge in the rear.
What is putting you off getting the 2.2?