Best in-wall speakers for rear channel?

I've been considering these 8" kevlar 2-way, angled speakers from Monoprice:

https://www.monoprice.com/products/product.asp?c_id=109&cp_id=10837&cs_id=1083703&p_id=4929&seq=1&format=2&style=

I have Niles HD-8's in my ceiling for the rears. I am not sure what model they have been replaced by, but they have been fine. They were about $599 retail when new. I have Maggie 3.6R's up front.

I have found that the rears fire so seldom that it doesn't make a huge difference in movies what the rears are, if you want them at all.

I helped a freind do his HT install and we used the Linn Sekrets with very good results. But there are many new options out there. I would really look at what is the closest voice match. And if at all possible go with magnepans that can be wall mounted or placed in a corner.
The voice matching is especially noticable on DTS and the new BluRay discs.