I find it funny that people will gladly pay hundreds of dollars to make their car look nice or go fast but want to push the time between oil changes. I have no info to offer to argue when you should change your oil. But I believe that the extra $20 every now and again to get the oil changed every 2500-3000 miles is not a very big investment. This is just my opinion.
And as far as metal pieces in the oil, you are right, the tolerances that metal is machined to these days basically eliminates any kind of break in, but there is still some things that need to be broken in and the engine will wear faster for the first couple months until parts mate with each other.
Long story short, a couple of more oil changes definatly will not hurt the car, so change it whenever you feel comfortable.
Tim