C++11 with review-enforced RAII. Boost if you need special stuff involving odd data structures. gtest/gmock. Depending on what you're doing, add some Qt5, OpenCV, OpenMP, RapidXML/RapidJSON, any C library ever written - and there are BSD/LGPL libraries for pretty much anything. Make plugins with Lua. Run tests in Valgrind.

I'm not sure I would choose something over the latest version, primarily because of how little a time investment using it can be... but then again it all comes down to what the task at hand is doesn't it ;P