I would buy neither. You can get a power2max powermeter cheaper and I have seen big problems with Bontrager wheels, specially the breaking surface that failed on first descent from a mountain. In one week I saw 4 faulty bontrager. Only one none Bontrager wheel where faulty ( broken spoke ).
I would go for the cheaper powermeter then maybe find the money for a highprofile wheels in a year or two. The feeling of riding a good set of wheels is fantastic. I understand why you are torn.
Have you tested the new bontragers? Maybe I'll change it out for Zipp 404s instead or the ENVE 3.4 Carbon Clinchers if the braking is that bad.. But I'm definitely not going with power2max, if I were to go with that I'd go with a powertap hub instead. Why? ----
The only criticisms that I've heard about the P2M powermeter is the inconsistency during a recent test/comparison to other powermeters.
They do make one for Lightning cranks. That's nice.
Powertaps are reliable, and are "lighter" than the competition. Or perhaps even the soon to be released pedal based units. I like the Aesthetics of the Quarq RED, and the beauty of the grouppo as a whole is also quite beautiful. I'm pretty set on the Quarq RED, I'm all for integration. Haha