i originally got into SW with an eclipse system 3, I quickly switched to a different tank, I now use the eclipse for an undesiarables/hospital tank ( i dont want to kill crabs and such just because they do what they do and had extra LR) in any case heres the problems I had with the eclipse systems (which are great for FW):
1: trickle filter is a nitrate factory
2: lighting is insufficent
3: poor water cirulation
4: cannot attach skimmer
IMO, you would be better of building your own system with the filtration you need.