Well HL2 is a very demanding game. So your going to need some type of moderate card. For 130$, i dont see you getting a board and video card either. Dont waste your money on a onboard mobo/card. Save it, then get a nice video card, such as the eVGA 6600 GT, which is around 160$. Also, dont get socket 478. All the new Intel processors are compatible with socket LGA775. With socket 478 you cannot upgrade..
Finished With TF.