Surroud and rear speakers

I'm building a new room which will be 13'x14'x 8'in the front and 10'9" in the rear. I now have a 5.1 system with di-poles for surrounds. I now want to go to 7.1.
My question is: Would another pair of di-poles be best or should i go for direct in-walls for the rears. (all paradigm studio reference speakers.)
Thanks for any input.
Marks2512,you asked the same thing yesterday.Be patient,someone will eventually chime in with some advice.
Sorry, wasn't sure which forum would be best suited for my question.
go in walls
can sound good with quality speakers