INTJ, no surprise there.
I've tested for this many times over the years. I will always be an 'I' and a 'T' and probably always a 'J' - figured that out about myself a long time ago. But I go back and forth between 'N' and 'S' and occasionally on some tests that allow for it, I get an 'X' in either the second or fourth position which I'm told means that it's too close to call. This usually occurs in the second position, which doesn't surprise me either. I used to always get the 'S' there but the last few times, leaning definitely toward Intuitive instead.
Edit: looking at the results so far, I wonder if we really have an abundance of the supposedly rare "Mastermind" here at Subsim, or if INTJs are just more likely to take the test.