We have an application built in .net framework MVC C# that we gradually want to convert to an SPA. We're about to redesign the page most heavily reliant on javascript and decided we need to implement a javascript framework in order to do this well. Besides, we'll need one if we want to become an SPA in the future. Which would you recommend? Angular seems like we'd have to rebuild pretty much everything in order to accomplish, even if we could do it one part at a time. React and Vue seems like we could just start using in this page and then gradually implement it in other places once we've learned the framework. Are there any challenges to any framework we need to be aware of? Which would you recommend? We will convert to .net Core in the future, would there be any huge benefits to doing it in this switch?

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We're a small team of three people, but we've been developing this app full time for a long time, this iteration is maybe eight years old? We have a good back end with our own database framework that communicates with the client via Wcf. Another thing we want in the future is the ability for the server to contact the client via SignalR or similar.