Building my first computer and all I have selected is the case so far and I'm deciding whether to get AMD or Intel CPU. I hear intels is a lot better but AMD's is a lot cheaper so that way I could focus on getting a better graphic card. I was wondering, which is more important for modern video games, a good CPU or GPU? Also, any suggestions as to what components or brands to use would be greatly appreciated.
You'll find that AMD usually has more bang for your buck at prices below $180.
If you read this site for a recommendation above that, and they'll typically give you an i5-750 recommendation. On most other sites, they'll recommend an AMD Phenom II 965 Black edition (125watt version) for gaming.
The main reason is on this site, they tested the CPU's on games with low resolutions, but with higher resolutions, such as 1900x1080, the AMD Phenom II 965 BE out performs it. But also keep in mind, the i5 will out perform the AMD chip in just about everything but gaming at higher resolutions.