Can't believe that a large % of people on here think that 60,000 is pushing the limits of what we could fill in the stadium.
We have sold out almost every home game (in the league) and 'prestige' cup game for the past 2 years, which has made it increasingly hard for the casual match goer (of which I am one now unfortunately after giving up my season ticket) to take in a game.
We need a large enough increase to allow the majority of City fans to get to a game when they can do, and to have a chance of seeing a home derby game etc. Plus, with (hopefully) a larger proportion of kids in the greater Manchester area choosing City over U****d in the near future we need a larger capacity or the next generation of locals to take up the torch.
Thats without any random tourists/day trippers to whatever the club have up their sleeves for the collar site.
I'd say 60,000 is a minimum, and priced appropriately (unfortunately not cheap as that will never happen :( ) we could easily look to have significantly more than this number when the bigger teams are in town. As several people have said....if you build it they will come.