What is the best Video Card That My PC can Handle???? (AGP) i dont have a pcie slot so please help!!?

i have a p4m266a-8235 motherboard. 512mb ram dual slot filled. and a celeron 2.4 ghz processor. i just need an agp 4x(accelerated graphics port) video card. so please help.. not a pcie nor pci video cards. so please elp! can it also handle also will this video card work??? SAPPHIRE 100228L Radeon HD 3850 512MB 256-bit GDDR3 AGP 4X/8X HDCP Ready Video Card