I use this machine for gaming recording and streaming and it can handle all of those easily. Almost all games at this point in time work well on this system achieving above 60FPS almost constantly.
You might have seen that I put the price of the RX 480 to £153. This is because I bought it used for around that price and I think that it can be fairly easily recreated on sites such as eBay.
Please feel free to ask any questions!