There so many good case lately, my pick would be phantek eclipse 400A, NZXT H710,Fractal meshify c and lastly lian-li pc 011 dynamic.
I've owned; Antec 900, Corsair 750D and now a Phanteks Enthoo Pro.
Phanteks is the best I have had. I cannot list anything bad about it so I would highly recommend them!
For your budget you could probably get either of the following (cheapest first):
- Enthoo Pro M or the Tempered Glass version <--- Really good case!
- Enthoo Pro or the Tempered Glass version <--- bigger brother (I own this one)
You can remove the optical drive cage,it would clear the space you need for your aio then. If you absolutely need a dvd drive,external usb one are dirt cheap these day.