Is this a good PC build?

Yes, Not the best, But on a scale of 1 to 100, 96/100. It has some of the Highest, Most Powerful PC parts, For Example, The Video Card, ATI RADEON HD 5770, Is GREAT. One of the Highest ATI Cards you can get. I am running on an ATI RADEON HD 3650, It's great. Your computer will be FINE.