I go the 40d (replacing the 35d) or the 30d over the 35i. But I live in out the country and diesels make a lot of sense out here given that premium grade petrol is super expensive and hard, if not impossible, to get in a lot of places. The fact that diesel gives you such a good touring range (I get 1000km+ from my E53 30d) is a major bonus for country driving.