I want to buy a Blackberry playbook , because it has all the requirements I need..
I prefer the 64gb one , it has more memory than the other. .
but is it too slow ,? can I get a reasonable speed on little apps with it ? or is it hangs during playing HD movies ?
It depends on your needs. But if I were you, I'm going for 64 GB Wi-Fi. Just use your phone as a hotspot or simply bring a mobile hotspot with you all the time if you want to be connected all the time.