Since you've editted this since my original reply, I'll provide another.
The Metrodome and the Trop fluctuate between hitter/pitcher friendly, they are neutral parks.
So that whittles your list down to 5 parks. In the NL there is Citizens Bank (Phillies), Great America (Reds), Wrigley (Cubs), Coors (Rockies), and Chase (DBacks).
The equal mix I indicated seems more accurate.