well I have a galaxy s3 phone which is ok but I have eye problems and feel a bigger screen would help that's all and 7,9" would be enough to hold as I feel 10.1" id too big
Get Nexus 7. By far better to watch videos in my experience than any of those I've tried and held in my hand, (iPad 2, Samsung's Tabs, few Lenovos, some random Acers)
I used to use my phone also in the same way like you (Galaxy S2), but the screen isn't really for watching videos I think... so small.
i had a S3 and i upgraded to a note3 and damn, im pretty fucking happy. super snappy 2.7 ghz and 3 gigs of ram is the best combo. also the mega screen size is pretty nice along with the s-pen. super handy ya!
patience is a virtue so after reading about the galaxy note 4 due in September if I wait just a little longer hopefully the price of the note 3 will come down a little which will put a smile on my face and being totally honest there is so much to choose from it makes my head spin