I don't think that link leads to a valid discussion. It's considering the older MacBook, not the one you can get now that really is the same as the Pro, most things considered.
To the thread starter: the non-pro lacks the illuminated keyboard, for one, and that's a feature I find I appreciate a lot. I also happen to like the aluminum look and feel, but some people actually prefer the white of the non-pro. The non-pro also has less connector things, but I know I've never cared about any of those. Not sure if they matter to you. And finally, the non-pro defaults to 2GB RAM instead of 4GB. I would, without question, upgrade to 4GB, making the price difference between the two only $100. Might as well get the illuminated keyboard, aluminum body, and fancy "pro" label for $100? That was my conclusion, anyway, when I bought one for my wife.