Engine selection

Hi the manschaft, I need your support. I want to buy a Volvo XC60 (between 2009 and 2013). The problem is, there are really many engine variants, and it’s really hard for me to make a decision. I have a few requirements: it has to be a diesel car because I drive at least 3500km a month, and should also be normal in terms of maintenance costs. With such small SUVs I would like to prefer an autimatic transmission, but if it makes sense, I prefer to let the professionals decide. And if you also know other SUVs that are good, please just mention, it can always help.