My husband needs to replace his ageing 1999 Saab 9-5 Estate SE 2.0-litre turbo with Hersch management system. It has 80,000 on the clock. Should he look for a similar car circa four years old, or consider perhaps the Audi A4 Avant 2.0 TFSI (211 PS) SE? Any other suggestions? Priorities include a petrol engine, a manual gearbox and a large capacity boot for transporting a model railway layout to exhibitions, which the Saab can cope with.