am3+ motherboard that fits the bitfenix prodigy

Solution
There are none at the moment and I don't think there will be any. Unlike Intel's new platform designs that only require 1 main chipset on the board ( like B75, Z77, H87,... chipset ), AMD's AM3+ design still requires 2 seperate main chipset : north bridge and south bridge, therefor requires more spaces on the board. That plus the fact that you need a good power design with tons of chokes and VRMs to run AM3+ CPUs well make it unable for the mini ITX form to have all the required spaces for those components.
There are none at the moment and I don't think there will be any. Unlike Intel's new platform designs that only require 1 main chipset on the board ( like B75, Z77, H87,... chipset ), AMD's AM3+ design still requires 2 seperate main chipset : north bridge and south bridge, therefor requires more spaces on the board. That plus the fact that you need a good power design with tons of chokes and VRMs to run AM3+ CPUs well make it unable for the mini ITX form to have all the required spaces for those components.
 
Solution