What you are looking for is something like a .NET RadioButton. There's no such component on Unity.
A [selection grid][1] provides a similar functionality
But if you need something that look like buttons, you'll need to use multiple [EditorGUI.Toggle][2] and store yourself the selected option when the user clicks an option.
Once you know which selection the user has made, drawing different things based on that selection should be easy.
[1]: http://docs.unity3d.com/Documentation/ScriptReference/GUI.SelectionGrid.html
[2]: http://docs.unity3d.com/Documentation/ScriptReference/EditorGUI.Toggle.html
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