The powertap website has C1 Chainring powermeter for $349. These had been selling for $699. It may be they are coming out with a new model soon and trying to clear inventory but reviews are generally excellent and it's lowest true strain meter I've seen at this price point and measures power through entire stroke (not just one side).
Make sure these are compatible with your cranks by checking compatibility table on their website as they don't fit the new 4-bolt Shimano cranks (105, Ultegra, Dura-Ace).
https://www.powertap.com/product/...chainrings
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And given that pedal-based systems are $700+ I think that makes the decision pretty easy...
If you can spend a little more I can recommend the power2max NG eco for its better crank compatibility.
Crank vs pedal I think is a matter of preference. The crank is more protected and battery life will be much longer. Pedals are more easily changed between bikes. Pedal is generally a couple hundred more expensive.
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