Good book reviews. The black army of Hungary is one I have also been interested in, cool mix of heavy knights and gunpowder. I've always been impressed by the Ottoman logistics and camp organization. One thing I would like to learn more about is Ottoman firearms development.
The Guns of the Sultan book goes into a lot of detail about their firearms industry. One army plan I have in the future is to make a Black Army out of those Perry Miniatures Mercenaries, that looks like a great box set for that late 15th/early 16th century period.