The other thing you may want to consider is whether to get a "wireless" or "wired" cycle computer. This may be important to you, since you stated that you already use a HRM. Devices such as HRM's, lights, etc...are known to cause interference with many of the wireless cycle computers out on the market. If this is a concern for you, then you may want to stick with a wired version for the cadence & speed, as interference is not an issue with the wired models. Just something else to think about.