Well if you're into racing (like rFactor), then you could use 3 monitors at once (one for the front, two angled on each side for real-time side views). Of course, you'd need a racing wheel too (Logitech Driving Force GT is a good value, or get the Logitech G27 if money is no object).
For your computer, I'd suggest a better graphics card (maybe a Radeon HD 6950 or Geforce GTX 560Ti, or a Geforce GTX 570 for longer life) and an overclock for your CPU (which would also need better cooling if you don't have it already). You might need a stronger power supply if you want to upgrade the graphics card. If you're going to go for a totally bonkers card, I'd suggest going with the GTX 580 and avoiding the GTX 590 or Radeon HD 6990 (those two use tons of power and are super noisy, yet get beaten out by lower, cheaper SLI/Crossfire solutions)
A Blu-ray drive and MAYBE a better sound card would make your PC even better for media. I can tell you that with good speakers (even 2.1), dedicated sound cards make a HUGE difference over integrated sound. Definitely, the blu-ray drive would allow you to take better advantage of your monitor(s).
Last edited 11/08/15(Mon)00:15.