There is enough space in the dock for devices of different sizes, because you put it upright while charging. An LED indicator shows how far your iPhone, iPod touch or iPhone charged.
The InCharge three docks are not yet available. Manufacturer XtremeMac says that all three are somewhere in the first quarter of 2012 will launch. How the InCharge Duo Plus will cost is unknown, but a previous version can be found in the Dutch online Apple Store for € 59.95. The InCharge InCharge X5 X3 and will cost $ 150 and 100 respectively.
XtremeMac's webshop is not shipped outside the United States. Given the online Apple Store, a previous version of the InCharge Duo sold, however, we suspect that these new variants will be for sale there.