I currently have a BMW Z4 coupe (57 - Dec 2007, 3.0 Sport manual, FSH, 44k), which I would like to change. I recently drove the new Z4 35i and was unimpressed. I probably will buy a Porsche Boxter S that I have driven a few times. I visited the main dealer in Hatfield yesterday. He tells me that both the Boxter and 911 will be replaced next year. If I were to buy either car which they have in stock I would get a discount, whereas, if I order a factory built car there would be no discount. Does this make sense?

They have, in stock, a basic 911 coupe with about 7k worth of extras (sat nav, full leather, wheel upgrade, etc.) with a ticket price of just under £75k. I'm told my Z4 is worth about £13.5k, which seems reasonable to me. This would make a price to change of £61.5k.

However, the dealer will offer a discount and has suggested a price to change of about £52k, representing a discount of £9.5k. I think he might sell the car for £50k if I were to say I would buy it on the day. From past experience I am aware that Porsche does not offer much of a discount. I am struck that this particular 911 at 15% or so off may be a good buy. They also have two Boxster S in stock, each at about £48k. The discount on these is about £3k making a price to change about £32k.

I accept that this is a personal decision and that these are quite different cars. However, does the 911 make financial sense at what amounts to a purchase price of about 63k down from 75k.