I've been looking at cycle computers. I don't care if they're wired or not. I haven't found many that have both HRM and cadence. I found a Polar one but it's wireless and too pricey for me (when you buy all the extras to make it work.) Cateye doesn't have one that does both, and a FAQ on their site says that they would interfere with each other.
I don't care if I have to get two devices as long as the total price is not too bad. I've read about the cadence trick where you use a speedometer with the sensor mounted on the crank and set the wheel size so the computer actually displays cadence / 10. That would work if I could find a cheap speedometer, and then use another computer with HRM. Or, a dedicated HRM (handlebar mounted display, I don't like wrist) and a cycle computer with cadence.