320i or 320d

[andrews]

I'm looking to buy a 3 series touring for the wife and kids. ITs not a company car will be a private purchase. Mileage will be low, I'm guessing it will do 8K/year. So do I buy the 320d or stay with petrol. I don't think the fuel economy is going to come into it but rather how much value each car holds, Do diesels generally have a higher resale value?

Thanks