Is there a good site / post to explain the differences between the products?

I am going to be updating my home network and am looking at what i truly need to make this work.  I’d love to see a comparission chart that shows clearly what each does over the other…  Is there such a site or thread on here for this?

Specifically, the products:

WD TV Live Streaming Media Player
WD TV Live Hub Media Player
WD TV Live

WD Live Plus Media Player


I should add.

My intent is to get 3 WD TV Live streaming media players all hard wired to the network that has a NAS setup, all connected via router. 

Are there any limitations to this architecture?