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What is the best ViewModel Collection for WCF RIA Services?

Hi,

I'm currently creating an registration application that will register records into different entities in my database. The whole solution is built in SL4, MVVM, Entity Framework and using WCF RIA Services. I have a heap of different views and viewmodels, all containing different types of input controls and bound controls (textboxes, comboboxes etc) and some dataforms.

Now to my problem, I really dont know what Collection type I should use in my ViewModels. Right now I'm using a mix of EntitySet and Observable Collection but I run in to different problems with creating cascading ComboBoxes and also some of my dataforms behave strange..

With this exellent article in back of your minds: http://www.riaservicesblog.net/Blog/post/View-Model-Collection-Properties-for-WCF-RIA-Services.aspx

What type of collection should I go for?

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