Alright so I'm very new to PC building. I'm currently in the process of choosing my components off of different websites. Right now i have chosen my case, (Cooler Master 311) my CPU, (Intel Core i3-3240) and PSU,(SeaSonic S12II 620w). I want to build a computer that can run the sims 3 smoothly on medium to high settings and after doing some research I've found out that i'll need to get a pretty beefy GPU. But while picking out a case run into a question. Will i need to buy another fan to go along with the case? The case comes with one and there is another spot for one but i figured that since I'm not going to be running an i7 processor and not too crazy of a computer, the one would be okay. I'm on sort of a tight budget of under $400. So do i need another or will one be good? Any help?