Mystery coolant leak

[BriceW at webtv.net]

I did the whole timing belt job 6,500 miles ago. So the pump is new.
I also have a brand new expansion tank from less than 3,000 miles ago.
So either the new water pump is bad.
The o-ring in the new pump is bad.
Or this is a crack in the new expansion tank.
Or a crack in the plastic of the old radiator
somewhere.
Or the auxiliary water pump is bad.
If the new water pump is the culprit can anyone recommend where to buy
another.
After hearing the story about the MF remanufactured power steering pump
here it makes me wonder if reman watr pumps could also be a problem.
Anyone else had pumps go bad this fast?
The coolant leak seems to be close to dead center on the garage floor.
If it would only leak again so I can watch it happen.
I appreciate all the suggestions very much.