What is the best editor for PowerShell scripts?

I like Visual Studio when writing C# applications. It shows me how many references there are to a class or a method, and I can easily jump to the declaration of a object or its class definition without having to search through all the files with ctrl-f. I have some Powershell scripts that refer to each other, and I would like to have this functionality when editing them also. Is there any editor that provides this for me?