Just get the Garmin Edge 500. You can get it for around $220 from ProBikeKit on sale. It does everything you want plus all the GPS tracking. You can have 5 pages of 6 data points each.

You're going to pay $100 anyway for anything that has HR and cadence so might as well double it and get the Edge. I love mine and I rode for 3 months with just the Strada Wireless. It was like night and day going to the Edge.