I would go for 5400 RPM drives in a notebook, 7200 will cause too much vibration in the wrist area and decrease the battery life. Go for a nice Western Digital 320gb 5400 drive.
I put in a Hitachi 7K500 drive (500GB, 7200RPM) and it's nearly silent and causes zero vibrations. Best HD purchase I've ever made. This thing is insanely fast. I wouldn't put in a WD Scorpio, unless you're really worried about battery life and want to have zero noise (the 7200RPM drive is always spinning and makes a small amount of noise).
If anyone is thinking of putting a Seagate...don't. Put a Hitachi in and disable power management when you get it (See my thread).