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You know, I've programmed in all the languages listed, except for BASIC (okay, I'm exaggerating a bit: I haven't used the C++ part in C). So, in terms of program functionality/time spent, Delphi has the best performance. Time is saved mainly because almost no time is spent on the user interface. At the same time, the Pascal version used by Delphi is not inferior in its capabilities to C++. So, I'm all for this package.
However, if we're talking about more modern C#, I can't say anything about it; it might indeed be a good language with great capabilities. But C# is very different from C++, so they can't be put in the same category.
Based on what I know, I'll create a list like this:
1) Java - for cross-platform applications, as Lord pointed out.
2) Assembler - for hacking, which can also be useful.
3) C - if you need to fix someone's C source code ;)
4) Delphi - for everything else.