I think a badger for 1000 or 2000 or whatever merits is unnecessary.
I think it's too early for this. I doubt theymos is going to introduce a badge for which
only he qualifies (>2000), with only satoshi reaching the badge for 1000+.
Note the difference (image from
Amazon):

In the end, all top reporters of today should receive top rank right from the start.
Top rank should at the same time be realistically achievable within two years or so.
300 is certainly a good starting point, but I somehow doubt that 1000 and 5000 are wise.
I guess that someone dedicated enough could easily make a few hundred per day.
If you go to the Altcoin board, you can find thousands of posts worth deleting with no effort at all. It's very boring, and feels completely useless to do, but makes it very easy to quickly get thousands of good reports.