My personal choice for screen size is 15", but that is very personal. For mostly writing and browsing, speed is not really an issue. An i3 machine would be fine. Machines at the lower end price wise often have only 4GB of RAM and 128 or 256 GB of SDD. I would update the memory to 8GB (a repair shop will do that pretty inexpensively). Don't be lulled into thinking you need a huge drive. I'm a heavy user and could get by fine with 128GB. I don't keep photos or videos on my machine, however. There are many on-line places to put this kind of stuff. Run Disk Cleanup regularly (I usually select everything) and tell it to clean system files and you should be good. I also reinstall Windows "clean" first thing and that gets rid of all the...