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Are you based in the US? Halo Aerotrack are solid, good value wheels in my opinion. No experience with the set you linked to. What do you intend to use the wheels for? If you are running a brake consider that the Mavics don't have a machined sidewall. That doesn't mean you can't use a brake on them but they might not brake as well as wheels/rims with machined sidewall. They might not look as pretty after some brake use either. For commuting I'd get the aerotracks, for track the Mavics.
Omnium cranks are cheaper if you get them from Germany
Not sure if this is the right thread. Any advice would be great!