changing things

i have this wet dry setup on my 75 its a aqua clear 150 gal w/protein skimmer wasnt cheap but i want to go to a sump set up w/ refug & possible calc reactor was thinking about using a 30 long for sump but not sure on skimmer and any other things that might be needed this unit i have works good but i just think i want to upgrade any ideas on what a good set up would be?as far as what skimmer setting up refug ect thanks

 

Going to bump this up. You may not be getting replies because there are already several threads in the skimmer section of this forum where skimmers of preference are recommended by forum members.