Whats your budget?
400-450 max GBP
Are these 2in1 type any good whereby they are both laptop and tablet....
I personally would rather just go for a smaller sized laptop (like 13 inch)- get better bang for your buck.
Tablet pc's prone to damage and cant embrace that much data, which doesn't really suit if you have loads of film and videos.
If your streaming loads make sure you have a good network card/Wireless to get the best out of your broadband. At a minimum I would make sure you have 8GB of RAM, at least 2.00 GHz processor and 1TB of storage should be more than enough storage.
Have bought machines of PC world before and signed up for there Know How cover plan - 7.99 a month or something. Definitely worth having in my opinion and it has saved me a few times!