Why no acer? I was thinking about getting one because my buddy uses one and he says he can play D2 and do other stuff with no problems. I was also thinking about the hp but it's a little more expensive.

Acer's are fine... I'm using one, only cost me about $500 a few years ago and it works great.
The graphics card isn't very good though... so games like WoW are playable, but you don't get a very good framerate.
For d2... any laptop can run that

What I did was I just got a basic laptop and upgraded just my graphics card, so I can do a little more then D2 with it.

I'll most likely get an Acer then. I don't want to have to spend any extra money on programs though.

asus eeepc 1005ha, it's under 400 bux if you buy it with the 4.5h battery and the 0.3 webcam

acer is cheap quality

This.

$500 wouldn't get you anything decent where I come from... Though it is mainly your internet that will cause problems. I was on dial up and couldn't do a Baal run because I would dc even if I stood at the far back corner, I swapped to a better net with the same computer and had no problems at all.

get a netbook ofc

the HP mini works great in my experience, haven't used any others.

mild lol

Check out the system requirements for D2.

Its like 200 mhz and 256 mb of ram. Basically anything you get can run it, and lag will be because of internet/bnet and not your computer.