Since you have 220 gallons of organic producing water, here are my suggestions:
If you are looking for an external skimmer, here is a great one... http://www.coralvue.com/reef-octopus-sro2000ext-super-reef-protein-skimmer
If you are looking for an internal skimmer, then this one... http://www.coralvue.com/reef-octopus-sro3000int-super-reef-protein-skimmer
If space is limited in your sump but you still want a skimmer in the sump, here is another one with a very small footprint... http://www.coralvue.com/sro-3000-space-saver-protein-skimmer
Regards,
Carlos
CoralVue