While the Bower flash units you mentioned may work in the TTL mode on your D80, it is not clear that they will work off-camera. I could not find any detailed specs on Bower units. I did learn that some Bower units do not have optical slave capability or PC ports for corded use.
I would suggest waiting until you can acquire the Nikon SB600. In addition to being a fine on-camera unit, it can be used remotely in the CLS mode under control of the popup speedlight in your D80. It is doubtful that the Bower units are CLS compatible.
My opinion ... there are others.
HBB in Phoenix, Arizona Nikonian Team Member
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I agree with Hal (HBB). Use the built in Speedlight until you can add an SB-600. Once you add the Nikon flash, the Bower will not work with the CLS system off camera. You pay for what you get! Good Luck and Enjoy your Nikons!