I used a Bubble Magnus Curve 5 on my 40 breeder and was happy with it. Changed things around and am now waiting to try out a Reef Octopus 110SSS on a tank of similar size.
I have the Bubble Magus Elite 5. I'm happy with it. Much better than the Reef Octopus I had on my old tank. If you go with BM, the difference between the Curve 5 and Elite 5 is the pump. The latter uses a high quality Sicce pump. Also this skimmer has optional add ons like an auto neck wiper or a manual neck wiper. At a minimum I'd add the manual neck wiper. I also added the Avast pressure cut off switch to prevent the cup from overflowing.