Wow, no responses?
Well if you're still around and care, I have a couple questions for you.
1. What is your objective, what type of applications are you wanting to develop?
What languages you learn is highly dependent on what you want to make. I've used C++ maybe 10 times in 15 years. C# is my primary language, and P/Invoke interop awesomeness allows you to call native library functions just fine. The last time I used C++, was when I was attempting to intercept DNS lookups to implement load balancing; only to realize later I could just inject a function delegate back into the CLR and call a C# function to handle the load balancing logic.
Unless you're doing low level development such as: operating system, hardware drivers, graphics/physics engines, embedded systems or applications with an extreme emphasis on performance.... C++ really isn't all that useful, and it's much faster to develop in a higher level language like C#.
Safer too.... much harder to develop a .NET application vulnerable to a buffer overflow attack or with a memory leak. Unless you're not using the "using" syntax awesomeness.
2. Is this as a hobby, or potential career. If career, the answer to question 1 is even MORE important. Choose wisely.
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As for your original question, after finishing all those videos in the playlist; your skill level will be around a 3 maybe? You'll know the language syntax, but still won't have any familiarity with the variety of frameworks/APIs/libraries that a professional uses on a daily basis. And word of warning, WinForm development in C++ is a pain in the rear.
Unless you have a specific reason to go C++, go C#. If you're anti-Microsoft, just use Mono. Recently, instead of C# being a Java clone, Java has more often been playing catch-up with the CLI and C# ECMA standards and copying C# instead.
If you want to do mobile (Android) development, start with Java. Once you know Java or C#, the other is mutually intelligible. Like Spanish and Portuguese; not exactly the same, but close enough that learning one after the other is much simpler.
If you want to do iOS development.... Objective-C is like the cousin to C++. C evolved into C++, and C evolved into Objective-C. And it's only useful on Apple products. So... yeah, to hell with that.
