There is a thread round here somewhere, sorry but the search function isn't working or I'd dig it out for you where the fella was looking for advice on what vehicle D3 or D4 and he was torn between the two as the D4 was newer but the D3 was HSE spec, few miles between and same YOM, highest spec as it gives best bang for your buck. It is easy to get drawn into the newest vehicle but if you can get a slightly older vehicle but with a much higher spec, better service history, lower mileage etc, then I would also bare that in mind when considering potential vehicles.