I am building a PC that will be used for gaming(1080p). I have 2 screens that will both be used at the same time. On the PC I will also be streaming, browsing the Internet, Microsoft word, and using Microsoft PowerPoint. I will be playing games such as cs go, fallout, cod. I would like them to be at a very high setting so I can get an extremely good gaming news experience while also doing other tasks on the other monitor. I'm having trouble deciding between a i5/980, and i5/980ti, and a i7/980ti. I know which would be better but I would like to know which one is best suited for me based on the fact that I'm 15, paying for this myself, never have had a job, and care about money. Is the performance increase worth the money?