First off, my bad, the space is 15x7.5, not 11x7.5. I don't know where that 11 came from, but I just remeasured.
9x9 wouldn't fit in my sump.
SkimmerWhisperer recommends the EuroReef as well, and you can get blemished versions directly from them at http://www.h2otropicals.com/. If I could mod...