This is the one I went with in the end. It was easy to program once I realized that I had to stab the unfolded paperclip into the little reset hole really, really hard to get things started. It has no bells and whistles to speak of and it's small enough that you can clip it to your bra without looking like you have third boob.
Like I said upthread, I'm pretty sure it doesn't calculate milage correctly because there is no GPS or web connection so it relies on your average step length, but all I wanted it for was to count my steps without reporting my heart rate, REM cycles and poop transit times to Apple/Google and it does that like a charm.