Looking for an updated theme for a networked Sports Magazine site

We have a networked site at vype.com that was custom made, but the developer has left the building so to speak and there are so many custom modules, that when we try to upgrade to the newest version of WP it crashes our site, which, as a network, gets nearly 3M pageviews a month.

We would like to find a replacement that can provide the variety of information and content we have in a clean format, keep our networked capabilities and is also mobile responsive. We know we'd have to customize (without custom code!!) and get it migration ready, but we just don't know where to start and are hoping that someone out there in WPMU land may have some ideas to lead us astray with....

Thanks!!
David Kravetz
Admin for vype.com