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That's exactly my setup except for the power meter. I have no regrets upgrading from the 500 to the 510, it was worth it purely for that feature.
The Bluetooth syncing makes it all completely hassle-free. Finish a ride, save it on garmin and if Bluetooth is already on it'll automatically sync it. That's it. You get a little notification from strava on your phone, press it and choose what bike you rode, name the ride (if you must) and tick whether or not it's a commute and click save.
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How do you know which models have bluetooth syncing?
Looking at these three: https://buy.garmin.com/en-GB/GB/catalog/product/compareResult.ep?compareProduct=543199&compareProduct=561299&compareProduct=166370 none of them say.
So I guess the key is:
PM and HR > Garmin > Garmin Connect (mobile) > Strava > Google Fit.
Then everything is connected and happy :)