I have used the Shimano 70 and 80 series dyno hubs and the SP PV-8. All of them work fine, but if you do an occasional brevet, then maybe it's worth spending a little extra and getting the SP (I did a SR brevet series with the PV-8). I have the IQ Cyo, but now I would get the IQ Cyo premium. The B&M Luxos has a star wrench to mount the light--I'm not sure about the Cyo premium. The regular Cyo had a normal Allen mount, but it may make sense to try to swap that out with a star bolt or something that is more difficult to remove and steal.
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