Hi maarescal
IMO the best leather bookcase type case is made by PDair in fact I'm about to buy one myself as i already have the PDair car mount so this would make perfect sense for my in car set up. I have used their cases in the past and the leather is great quality as is the stitching and whole construction of the case in the UK they are about ?13 which considering its real leather and made so well is not expensive at all for what you get.
Marc