I know it's going to sound arrogant, but your issue is that you are basically trying to do two things I wouldn't recommend.
1) Trying to do a high end AMD build at anything other than ATX form factor.
I'm sure you've realised by now that there is a huge lack of support for AM3/AM3+ at mATX and ITX forms, the former predominantly being some 760G chipsets and the later being non-existent. It is possible to find a board that fits your CPU, but finding one which is a solid performer when it comes to overclocking etc. is near to impossible, not to mention the various modern features you miss out on.
2) Trying to do a build in a Bitfenix Prodigy M.
I'm a big Prodigy fan, but I've yet to come up with a single build in a Prodigy M which I like. Either it's totally gimped by poor airflow, the length of one component impedes another component, or you remove advantages of the form factor itself - making the ITX Prodigy a clear winner.
If however you do want to push ahead with this, you'll likely want one of the 760G motherboards.
http://pcpartpicker.com/parts/motherboard/#xcx=0&c=3&f=7
Most of them should be compatible with your CPU, but double check the CPU compatibility lists first - some will only cover up to 95W CPUs.
Few things to watch -
■ A lot of these boards use PCIe slot 2 as the main graphics card location. This gives more room around the CPU socket, but in the Prodigy M it may cause issues if you want to install an optical drive as it pushes the graphics card into that area. On the plus side, this move does give you extra PSU length.
■ Speaking of PSU, I don't know exactly which PSU you have but at a guess I'd say you'd be fine on length. Here's what Bitfenix themselves say (I assume this is with the graphics card in the first PCIe slot though)
Q: Will the XYZ Power Supply or ZYX Video Card fit inside the Prodigy M?
Video cards at 9.5inches or less will have 200mm of power supply clearance
Video cards at 11 inches or less will have 160mm of power supply clearance
Video cards at over 11 inches will have 150mm of power supply clearance.
■ The stock images of the Prodigy M on the Bitfenix website show a Prolimatech Megahelems, which is a couple of millmetres shorter than the CM V8. If I had to guess, I'd say you'd be fine, but this image shows how tight things are in that area if you fit HDDs on the bracket.
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