I am trying to find some good themes for a Sports-related Multi-site Network. We will want to use the same theme across 9-10 sites, but each will be customized a little different. Any suggestions would be helpful.
Take a look on this page hope you will find your chosen theme from here
Depends on the complexity of course but as you will need to buy a separate license for each site it may be worth looking at www.studio.envato.com and having someone put something together for you.
Enfold theme is best according to me.