Another Cygolite Metro user, here! I have both the 750 as well as the new 1100. Honestly, there's not much difference between the two, so I usually recommend whichever one is cheaper! You can often find them used for around your price range, though! And in fact, you can buy the 700 or 850 lumen model right now for $50 on Amazon, new. I also have one of the lower lumen models (400?), but I don't usually recommend it because the light is more yellow and it doesn't have the diffuser lens so the beam pattern doesn't spread very much.
Fantastic lights! You can't go wrong with them.