I am 63 years old, 6-feet 1-inch tall, all-but-retired and use my wife's Prius for local and social driving. I have a 1998 SAAB convertible (with its original registration number S44B BD), which is all but dead and valued at no more than £500 (less than the registration alone?). I need a car for regular round trips each year from Reading to Manchester, around 90000 - 10,000 miles a year in total. It needs to be large with four or five doors for the future transporting of an ever-growing number of grandchildren.

I am looking at two cars at my local garage, a Honda dealer, offering a Mercedes-Benz E220 CDI Elegance 4-door automatic saloon with 80,000 miles at £7495, and an Isuzu dealer offering a Porsche Cayenne S 5 door Tiptronic with 95,000 miles at £9995. Are these two cars reasonably/sensibly priced? Are either or both likely to be good for another five years/50,000 miles? Your thoughts and comments would be greatly appreciated.