DM is clearly first priority. But after that, I would, at the risk of being unpopular, sell Ozil, bring in a young replacement (Firmino) and then either try and get Benzema or bring in one of the young, high potential strikers at whatever cost - Berardi, Dybala, Vietto, etc. Ozil to me doesn't offer enough and I'd rather take a risk on a potentially great striker and replace Ozil with perhaps a somewhat lesser player - I think the risk-reward works in favour of that option.