Not sure about the boot section. Common fault is damp in the footwell, caused by blocked air filter - if not traced and cured then this could start to cause 'damp' smell. There are of course various internal channels which guide rainwater away from the body, which may become blocked, as with any car. But Omegas are not 'prone' to smelling of damp. A smell is the easiest way of being put off something, a car, house, anything - the reverse being true, why supermarkets pump baking bread smell into their stores for promote spending

I know you're always going to be limited to what car you can get, but have to say aim for a V6, the 2.2s aren't 'bad' but you're not realistically going to do more to the gallon (in spite of what the brochure tells you), and you just get everywhere a bit slower

Personally love my auto box, and find the Omegas an excellent one. Had several people compliment me on the smoothness of my gear changing before they realised my hand hadn't left the wheel for a period of minutes and they realised it was an auto!