My grand daughter (17 1/2) has just got a Samsung Galaxy tab 2 7" and it does all those things for the same purposes as you. We did buy the dock type Samsung keyboard. She connects it by USB to the laptop when home and the Samsung word processor comes in in Word format for editing and printing. She got a 32gig mini sd to boost the memory and has converted her iTunes music to MP3 and imported it. I am looking at the 10" tablets, and although iPads are good I think other tablets have features like memory slots that give an edge. I am looking at the Nexus 10" (out of stock) or the Samsung Tab 2 10". This is not quite as good on resolution but has many good features. I think the Nexus and the Samsung can hook up to USB sticks or external drives with adapters. THe Nexus has a mini HDMI so could connect to a TV to watch iPlayer etc.
What is ransomware and how do I protect my PC from WannaCry?