Best graphics card

What do you think is the best graphics card (to use with blender, gimp, make human, ect.). I’m am looking to get a new one to replace my intel chip. I have a MacBook pro running lion.

Here are my specs:

2.5 GHz Intel Core i5. 4 GB 160 MHz DDR3. Intel HD graphics 4000 384 MB
Tell me what you think.

Your best bet is an upgrade from MAC. Probably a FirePro.

mac laptops dont have replaceable graphics cards… the one you bought is the one you are locked in to…