USB hubs

I'm looking for a 4-port hub for the iMac DV special edition and would like to know the benefits of the hubs that don't require an external power source versus ones that have the external power plug.  Does anyone have experience using a hub that he/she could recommend?
jclappAsked:
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jhanceCommented:
The non-external power supply models may be severely limited in their power sourcing capability.  Since the power comes from the computer, the amount available is limited by what the computer is designed to supply.  In most cases, that is not much.

Most of the models with external power supplies are capable of supplying quite a bit more power to USB devices.

Other than that, there is little difference between the different hubs.
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