We're in the process of building our fishroom to house our new tank. I really like spiff's setup, and his two Ultima 4000 filters for redundancy.
http://www.monsterfishkeepers.com/forums/showthread.php?t=259560
We're going with mega filtration on our 1800 gallon tank, utilizing two Ultima 4000 filters for biological filtration run with ReeFlo Barracuda pumps. For mechanical filtration, we will be using four large spa filters connected to two Hammerhead pumps. Because there are two 4' external overflow boxes, one of the Ultimas will be drawing from the 336 gallon sump and returning the water to the main tank. (We were only able to get eleven holes (for 1.5" bulkheads) drilled in the top of the tank for uptake and return lines) One of the Ultimas will also have a 120 Watt UV sterilizer connected to its return line (haven't decided on the UV sterilizer yet). There will be seven uptake lines from the tank (not including the two overflow boxes), and four return lines. I'm still deciding whether to go with an inline heater, or submersible heater. We will be running a Clarity CL-3 protein skimmer off the sump utilizing a ReeFlo Tarpon pump.
http://www.monsterfishkeepers.com/forums/showthread.php?t=282582
Since the fishroom is being built, we will have drains/water lines for purging of the Ultimas and adding and removing water.
Triangular area will house the filtration room. Area under the 2,500 pound acrylic tank is reinforced. Foundation to be poured Thursday. (80% rain forecast for Tue/Wed). It's going to be a really tight fit in the filtration room. Hope I measured and planned it out right.
I chose not to go with a wet/dry trickle filter because of the frequent power outages in our area....oh yeah, I forgot that we're installing a generator that will turn on when the power goes out.....but right now, I sometimes have to get up at 1 or 2 am to add water to the tank to get the biomedia submersed in our wet/dry system..when the power goes out. With the Ultimas, the media is submerged when the power goes out. Either way, it shouldn't be a problem with a generator. I realize that the Ultimas would handle the mechanical filtration, but I like the spa filters so much, I'm not willing to give them up. We will have four poop suckers (1.5" pvc) coming down 1/4" off the floor to pick up debris off the floor. I always have the option of throwing biological media into the sump, but really don't think I need to...we'll only be housing our two pacu and have no plans to add other fish.
Since you're an FX-5 man, check out the Ultima 6000 and Ultima 10000. Actually, even one Ultima 4000 is overkill for a 2000 gallon tank.
http://ultimafilters.com/ultimaiifilters.htm