Just buy the latest version of the Firestick, 2nd gen or hold on for the new 4k version which is due out very soon I believe. They are very easy to setup and use. They are not the fastest devices in the world, but for the money you cant complain.
If you want to spend a bit more, for a bit more speed etc then go for the Fire TV. You will get both of these at a good price on Black Friday if you can wait a few weeks.