Okay imagine this...
Drilled bottom, whatever size tank you want. Hole ->pvc pipe->eheim wet/dry filter (or any big eheim with heater built in)
Now, in that pvc pipe leading down to the eheim, put a spigot. This spigot now makes water changes a breeze. Plug in hose and out it goes. Since the tank is drilled, all the crap at the bottom rushes out through the hole. Easiest water change possible.
For additional filtration, a Tidepool II
Then 3 emperor 400's across the top.