Do you have a computer already? What do you intend to do, play games? A HD 7750 far surpasses the performance of the PS3/360. It is, after all, an 8 year old console and the XBox 360 is 9 years old.
If you already have a computer, you can list all of the parts and I can maybe suggest something better than a Core 2 Quad and 4GB RAM. Both of them are quite outdated for games.