Lahm will not move from Munich. There are two great fullbacks at City though mate. Kolarov and Boateng are both class. Zabaleta and Richards are class too. I'd recomend training Zabaleta as a LB/LWB as his secondary position as it only takes a few games before he is accomplished in that area... Sell Bridge though, He's ****.
In fact The Man City team is More than good enough from the start so you don't have really buy anybody. Just sell Abebayor, Santa Cruiz, SWP and Bridge then buy Dzeko. Play a 4-1-2-1-2 diamond and you will destroy every one in your wake.
Just buy wonderkids for the future. Paulo Henrique, Sakho, Lukaku, Sanogo etc. No need to buy big just because you have the money. Great squad already.