hi xefera,
I just got myself a used e90 LCI 323i as well, it's a 09 model. The mileage was 42000km with PML warranty, so far I needed to change the brake pads and brake rotors as the on board computer prompted but I didnt go back to PML as the price was crazy, as for the other stuff, they look to be in pretty good condition. You may want to share more details regarding your ride like what year and mileage so that people in the forum can share their experience on what they have to change during that period..... I paid about +-$1K for the brake pads, rotors and sensor ( all original BMW) and it was done within a few hours.