Looks great. What are you planning for overflows?
yea...a tank that size I'd go with a sump as it will cut back your maintenance time by a lot!!! especially if you were planning on using a few fx5's.
Okay so after looking online I've found sumps that pump up to 1300gph so far I havnt looked into industrial ones but two fluval fx5 the flow rate is 800 gph and that's with them packed right... Also I always have the ability to do a sump if it doesn't work.... It doesn't have a overflow on it
I guess it depends on what you want, and if you already have the fx's already too. If you are set on canisters then that would be the route for you to go but there isn't a reason I could see other than space restrictions or personal preference not to go with a sump?
Either way looking forward to the final product.