Laptop components

Hello, I am in need of a laptop capable of running 3d graphics programs. In my search I have come across varying l2 cache sizes (anywhere from 1 to 12 Mb), different FBS speeds, and hard drives RPM. I would like to know just how much of a difference in performance these components will give me. For example, I find two different hard drive speeds, 5400 and 7200 RPM. A 33% increase in speed in the hard drive but I'm sure it won't be the same in overall computer performance.

To sum up, I would like to know just how much of a difference these three parts will make.

1. 5400 vs. 7200 RPM SATA HD
2. 3MB, 6MB or 12MB L2 Cache
3. 800MHz, 1066MHz or 1333MHz

Thanks for you help.