Thank you for posting in the forums! That's a great question. I will list all of the technical specs for all current models. By looking at each of these, you can decide which Slingbox would be right for you. Also, the Chromebook is not yet supported as a device you can watch from.
Here is a link to an article that tells you what operating systems and web browsers are supported in Watch on Slingbox.com:
Below are the tech specs for the Slingbox PRO-HD
This is a comparison between the Slingbox 350 and the Slingbox 500:
Hope this helps!
The Sling Moderation Team