are the Bugatti Veyron, Aston Martin DB9, Fiat 500, Audi R8, Lotus Elise and Jaguar XKR, XF and XK. Of all these, the Audi and the Mazda are the best investments. This summer, some motor traders have been picking up TTs that are about 12 years old (with just under 100,000 miles on the clock) for just over 2,000 before selling them at 4,000-5,000. MX-5s of similar vintage have been snapped up for less than 1,000 by dealers, who have then sold them at 2,000-plus. If private buyers grab these models at the sort of low prices the motor trade is paying, they'll acquire some of the best automotive investments out there -- and for a comparatively modest outlay. * Two weeks ago I told you about Fords with a third off . Now I can reveal that with a list price of 16,149 and a discount of 5,161, the Citron C3 Picasso VTI Exclusive is the latest new car to be blessed with a 33 per cent discount. At least it is if you purchase it via a leading independent specialist such as Carfile (01335 360763), which sources its cars via franchised dealers in the UK. If you'd prefer to buy direct from Citron and its franchisees, on offer until September 30 is the C3 Picasso VTR+ with zero VAT and a free finance (0 per cent APR) package. If you've got 11,000 spare, go for the first deal. For those who need to borrow the money at no