Good news: Griffin's new StudioStand ($50, aka Studio Stand) is exactly the sort of case we've been hoping for since the iPad was released in April, combining a solid black hard plastic playthrough design with a fold-out rear stand that's ready for action. By action, we mean it's capable of holding the iPad in landscape or portrait mode, then flipping back into the rear shell with only a modest increase in profile. The only bummer: unlike Griffin's…