What American City could be the Next NYC?

There are several cities that are increasing with population, structures, and better skylines. My question or to get the opinion of others is what American City can become the next NYC. Skyscraper wise a population wise. Los Angeles has had a massive rise in polulation and I was reading somewhere that it might surpass 8 miliion by 2015-2020. Also Miami is a hotspot. With cranes everywhere, it is starting to look like those Chinese cities. Any suggestions? My picks are: 1) Miami and L.A. itself. Also San Fransico looks like a possible canidate.>