What is a good graphic card for Windows 7 Notebook 4BG 64 Bit i5 for Bitcoin mining ? Answered

I am a beginning bitcoin mining and want to set up my Asics note book to start out to get the biggest bang for the buck.  I don't have extensive computer knowledge but I learn as I go. Here is what ya need to know about my pc:  Asics Notebook K52 with Intel Core i5  2.4 Ghz  4Gb currently has Intel  (R) Graphics Card. I will be using GUIMiner to mine. Appreciate help from you folks.