Generally, I like to keep the temporaries. Mostly it is a consequence of getting burned and trained by the Visual Studio debugger; trying to put anything too complicated into the watch window or even evaluating it in the immediate window tends to be an exercise in frustration. It's also easier to step into the sub-expression/function call if need be when I do this, which is not always the case if it is a parameter to another function.
I feel like there is some law in the universe that says that if I don't use an intermediate variable, then I will for certain need that intermediate variable some time later when I'm debugging.
