An option would be to download the .tar archive from the tor website, unpack it somewhere (/opt is a good place), and run the "start-Tor-something" script to launch the browser. You can use the menu editor (alacarte) to add a regular menu entry.
Well at the moment graphics cards are overpriced. Recently I build a new computer, top of the line stuff except for the graphics card - too expensive. So I bought a second hand Radeon R9 280x (the one without the "x" is far worse for somewhat more complicated to explain reasons). You can still...