Garmin 500 best for HR and cadence???

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I've been told I really need to upgrade my cyclometer to help me maintain my cadence. But I've heard heart rate is also important to monitor. So I found the Garmin 500 for like $349 bundled with both. Is there anything better or less costly?? Or is this my perfect choice?

Garmin Forerunner 305 will do both. This is what I use for my bike computer. I think you can get them for about $140 (including the HRM) or less on Amazon. You would only need to add the cadence sensor, which I think was maybe $40. So for <$200 you should be able to do what you need.