I use a Water Blaster 5000 on my 120g system but I've seen people using them on upto 240g systems. it's a 1300gph pump that I estimate is pushing around 700-800gph through my sump. Dead silent and no issues so far for 3 years.
Also pretty happy with my Skimz cone sk201 skimmer which could handle a 180g system. I think they are selling slightly different models now.
I divided my sump chambers a little different than most. Skimmer chamber on the left, fuge on the right and they both drain into the middle (return) chamber. this allowed me to cut the return flow in half traveling through each section. And I didn't want all of the highly oxygenated water from my skimmer traveling through the fuge which is less ideal for algae growth.
You doing a internal or external skimmer and pump?