In June, Oculus raised $16 million to finish research and development on its critically acclaimed virtual reality headgear, and today the company's taking the next step. With a new lead investor, Andreessen Horowitz, the company has now secured another $75 million in Series B funding. Marc Andreessen himself is joining the Oculus board, along with fellow partner Chris Dixon, and it's a brand-new version of the Oculus Rift headset that convinced them to join in.