So I have a prebuilt pc that I have been upgrading with parts I get from old towers laying around. I'm looking to upgrade but I have no clue where to start. The cpu is an AMD A4-5000 which has no upgrade patch because it is soldered to the board. In order to upgrade the CPU I must buy a mobo as well. I have 8gb of gddr3, and the graphics card is an ATI Radeon HD 4830. I have a budget of around $250, I can go slightly higher if needed. I just need to know where to start, should I spend it all on a good GPU or all on a CPU and mobo, or go more budget end and get all 3? Any pointers will be greatly appreciated.