I currently have 2.6.5 since that was what was available for Windows users at the time I installed it a few years ago. It would be cool if there was a place to install the latest GIMP compatible python for Windows. Got the instructions at GIMPUsers as I recall.

Gimp 2.8. comes with Python 2.7.5, it's all you need.
Python 2.7.6 is considered legacy but works fine. Python 3.4 is the newest version and somewhat different. If you are a developer it would be more of an issue. At issue backward compatibility.
Keep in mind, in Gimp Python 2 scripting (plug-ins) might not work with Python 3.

If I'm to understand you odin, that means I can uninstall python 2.6.5 since 2.7.5 comes with GIMP built in, right?

Just uninstalled all python 2.6 and subsidiaries and GIMP python still works fine; thanks for the info Odin; don't want anything on my computer that's not needed and can be exploited by other programs.

Open the Python-Fu console in Gimp to check your version.

Thanks for the clue Odin; using 2.7.5 32-bit. Wonder why GIMP 64-bit is using a 32-bit version of Python?