I'm looking to start up a 90 gallon reef

[Rickyrick]

What will be the best filter for this?

 

[Rutrag]

I'd go with a large sump With inflows to a filter sock or two and an oversized protein skimmer to start. If you can add in a refugium or algae scrubber, so much the better.

 

[AquaRick]

Live Rock + good flow is the best filtration in SW. Make sure you ahve enough rock in your tank!