| Ageia - that's only for games - it improves physics, but adds details and make the game slower.
C2D - you'll have to change processor (C2D), motherboard and RAM (unless you have DDR2) - 200 pounds is not much for that
Graphic card - 6150 is onboard, am I right ? If yes I would choose some better. If not, you should specify what will you use the computer for. In 3D it only helps you move in the viewport.
If you have AM2 platform, I would buy some dual-core (Athlon X2) and maybe a better graphic card.
Martin |