I\'ve been doing some prototype work on a new Silverlight application using Caliburn Micro as our MVVM Framework. The team has generally been happy with it. In order to address
Use both! This blog post should get you most of the way there - it's actually very easy to take existing ViewModels that use other frameworks and "RxUI'ify them". This way you can try out ReactiveUI on a single ViewModel without having to pick either Caliburn Micro or RxUI.