God no, kill TechSupportForum.
Basically, power supplies vary in more than just wattage. The design used and the quality of the parts and the configuration of the controller chips, etc, varies widely. You want a power supply with the tightest voltage regulation (least voltage drop as load increases), lowest ripple/noise levels (follow the link in my sig for an article on this), highest efficiency, etc. In addition, many sellers of power supplies blatantly lie about the capabilities of their power supplies, "overrating" them, for instance claiming that a crappy 250W unit is a 680W (though this is an extreme case). In addition you want the power supply with the most reliable parts and best build quality, with the longest warranty and best cable configuration, etc.
Also you don't want a power supply that's completely overkill for your system (which unfortunately many people don't seem to grasp).
There's a lot to this subject.
You didn't give me your opinion!