I like my Sigma 1606L. It has cadence, but like ItsJustMe says, once you know your cadence... you know your cadence and you won't really have to refer to it anymore.
The computer has performed quite well. It's display is unreadable at around -20C or so, but the computer still functions so your trip distance etc will be accurate at the end of the ride. I've tested down to -37C without any issues other than the display. I've also ridden through torrential downpours, so it's water resistance is perfectly adequate. The buttons have held up well 2 years later.