I need a breakdown on how to pick and purchase memory for a mac?

-Exactly what the title says. I'm a little out of my depths concerning anything technical....



Model Name: MacBook

Model Identifier: MacBook5,1

Processor Name: Intel Core 2 Duo

Processor Speed: 2 GHz

Number Of Processors: 1

Total Number Of Cores: 2

L2 Cache: 3 MB

Memory: 2 GB

Bus Speed: 1.07 GHz

Boot ROM Version: MB51.007D.B03



I want to have enough memory to play a game on my computer and to maybe support having Windows.



I found this link: http://support.apple.com/kb/ht1651



But that really doesn't help me pick a nice affordable, yet reliable, memory card... thing. I checked out Crucial, but they didn't seem to have MB51.007D.B03 as an option.



Can anyone help me with this? Also, maybe suggest other things that should be +1?