I've been doing a looking around at equipment, my budget isn't as high as I would like so I have to work with what I have. These are the items I have in mine:
UV sterilizer:
Saltwater Aquarium Salinity & Specific Gravity Testing: Portable Refractometer
Pumps(one for return, one for CLS, both 1000gph):
Aquarium Water Pumps & Water Movement: Quiet One Pumps
R/O system:
Aquarium Water Quality: Pure-Flo II RO Units
ATO:
Aquarium Maintenance & Plumbing: Auto Top Off Controller