Please, please DON'T buy an Insignia! I had the misfortune to drive hundreds of the things when we had them on fleet.
Uncomfortable seats, uncooperative gearchange, lifeless steering, limp engines, dodgy build quality, poor reliability. A car for dedicated Vauxhall fans only!
As others have alluded, part of your problem is that there are not very many cars available of the sort you are looking for. New car buyers haven't been buying them for some years now. Either they buy an SUV/crossover type thing or a posh German moneypit-in-waiting!