The spinner also does double duty as a steering wheel on my panel. Crude but effective. The spinner works really well for Championship & Super Sprint, one of my favs. Unless you're going to have a seperate sterring wheel panel, consider the spinner a steering wheel too. But - the t-ball works for that too, just not nearly as well. And how about Arkanoid? I didn't think I'd play that (those) games, but got hooked.
There's always those games you weren't planning on playing that will bite ya in the butt later. If you can swing it, I would recommend putting a spinner on. After all the effort you're putting into your cab, don't sell yourself short by not putting one on!