If you have a smart phone, use that. I've had all the fancy Garmin ones and have since gone over to my iPhone in a stem mount by Quad Lock using Cyclemeter and a bluetooth speed cadence sensor from Wahoo Fitness. I carry the phone anyhow and this gives me everything my bike computer did plus a better display and I have to carry it anyhow. It also will work with power meters, remote displays, heart rate sensors etc....

J.