I just want to let those who doubt to get DiabloIII, (and have a low-end PC/laptop like me), know that it is very playable.
I have a 1.86GHZ CPU with a Mobility Radeon 3000 HD series videocard and 4G of RAM (you can look up my excact specs @ my profile).
Im running with a 1024x600 resolution, anti aliasing is turned on and the texture quality also is on high. The rest of the settings are turned off ofcourse.
The game runs smoothly and I'm very happy with that, I didn't expect it to run this well.
So that's it, maybe with this info you finally decide to give it a try!