Upgraging filtration for a 210 gallon tank - what should we get?

Wow it has been a long time since I have been on here. I could use a little help. We are going to sell our complete 54 gallon corner bow set up, so we should have some extra cash to spend. We have a drilled 210 gallon fish and coral tank. We have 2 tidepools underneath with 2 large pumps. We are looking to change to one big filtration system with an external pump (to lessen heat in the summer). Any ideas? We want to look into things before we spend the big bucks. We also have a good skimmer already so we may not need to buy something that already has one. Thanks in advance.
 
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