Yeah, this is another problem that I had. Plenty of full-tower cases these days support EATX, but SSI-EEB not so much (at least, the ones that can support it out-of-the-box).

In the end, I went with one of the Phanteks Enthoo [1] cases. Decent quality without breaking the bank :)

Notes:

[1] - http://www.phanteks.com/enthoo-pro.html