pci express x16 1.1 Which graphics card will fit better?

All over the world. System unit your want to do a little better. For a new computer, no money, sorry. So here is the motherboard I have a gigabyte ep41-us3l. connector is PCI express x16 1.1. Is Intel core 2 quad q9650. Which graphics card is best suited for my computer? And there will be enough for all this block of power to a 450W?