180g mixed reef - (2) 6100's, (2) 6200's, or (1) 6100 + (1) 6200?

[tbone28]

Which is the best combination for my tank? I'll have another 1225-2450 gph from my sump returns

 

[rvitko]

I would get 2 6100's unless it is heavy on SPS in which case I might get 2 6200's.