I haven't bothered getting a cyclocomputer yet, but I'd wager that my current max speed (under ideal conditions) is maybe 15 mph at best. I'll agree that my light's output is rather anemic, especially at dawn and dusk. However, I do the vast majority of my riding on the MUP, so feel that the higher powered lights are not warranted. I do plan on getting something with more 'oomph' ASAP- just in case my commute changes unexpectedly.

I'll probably get the C8 from SB first, as it uses AAA (what I have now) as well 18650 cells. Then I'll get the charger and 18650 cells, and finally order the R5 (or whatever model outperforms it at the time).