Quarq. The new Riken AL has aluminum crank arms and is $799! https://www.quarq.com/store/item/1747/
You will need to add chain rings though

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Make Inside Out Sports your next online tri shop! http://www.insideoutsports.com/

I switched from Stages back to good old Powertaps.

Any power meter that supports the ANT+ protocol -- which is to say just about all of them.

I have a Powertap on my road bike and Stages on TT bike. Both work perfectly.

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I ride:
Cervelo - P-Series/R3
GT - Sensor Carbon Expert

Supporters - Flo Cycling, Mount Bikes

The reason I switched from Stages to PT was the 920.

The Stages was mostly ok, but still had times when it would drop. Sometimes that was a quick loss of data that came back quickly. Sometimes it was a complete disconnect that would have the 920 tell me a little while later that it was now connected.

On the other hand the PT is very solid. In fact I was leaving the house to go swim today and it picked up my PT in the basement, withiut it even moving.

There is definitely a difference. At least in my own personal experience. And that is with two different Stages in two different bikes.