Mine would be just willing it to keep spinning.

The problem with the top is that it would be an indefinite exercise. Other reality checks involve a quick test as to whether you're dreaming. You look at the clock, the numbers scramble. You look at your hand, you have extra fingers. The spinning top would be too easy to lose interest in, or to dismiss it as about to fall anyway. It's different for everyone, I suppose.

The interesting thing about the totems in Inception was that everyone had their own, unique reality check. I think it would be more interesting to try to come up with your own totem than just taking the main one from the movie.

tl;dr: Spinning tops take too long to be useful as a reality check. YMMV.