You need a good looking case

When I built my PC the case was the item that took me more time to decide on. After all that's what you'll be looking at every day.
Well, I've been there and done that. My "big adventure" build of 2007 made a '95 Compaq ProLiant look beautiful on 3" braked double-casters, mirrored case window and provisions for dual bottom and dual front 140mm fans with dual 120mm San Ace exhausts. And there are some cases with enhanced cooling features at the top end of the price-scale. And I "put the brakes on" when I started contemplating the prospect of having the entire case chrome-plated. It would be beautiful, but not so sure some prospective buyer would want a case that big.
Despite the mythology that aluminum significantly enhances cooling, aluminum is more for looks. I have one system in a CM Stacker Midtower.
But I also bought some CM HAF midtower models with the 200mm side-panel and top-panel fan option in addition to the 200mm front-panel intake. Those were less than half what I paid for the Stacker, although the Stacker can be easily modded to accommodate at least one 200mm intake fan.
People say the HAFs are ugly, or "they have too much plastic," but for your budget SECC steel case, it comes with the tool-less features and the cooling potential -- I believe -- is often not completely tapped by owners for the extra chump change and effort it would take.
We now see not only mATX motherboards but ITX, and we can't say what the future brings -- the HAF 915 and "stackable" complements may or may not be that future.
So it gets down to this. You can spend $250 or more on a really fine case. From past experience, you can recycle it into the most recent computer building project. But if I can get top-end cooling and accommodations from something like the HAF 922, I'd rather spend my money on the difference between a GTX 770 and a GTX 780 graphics card.
That's especially true if you have a household of three users and as many as five desktops to service, maintain, and occasionally - upgrade or replace.