1 or 2 Rear surround speakers for 6.1 system?

As far as I know there is no real 7.1 surround system. I've read it is only a manipulation of processor manufacturers,taking some info from the side surrounds and directing them to the rear.

Muratc, 7.1 is a futuristic concept. It will allow for seven discrete channels of playback. Pre amps are being sold now with this capability but like everything else in this hobby waiting on the technology could take awhile. For now 7.1 will indeed rob info from the rears to feed the side speakers. In DD6.1 EX or DTS EX the sixth channel is in fact a discrete rear center channel. I doubt this will catch on but only time will tell. Personally I'm still perfectly happy with 5.1 surround sound.

I have a 7.1 set up now but I started with 6.1 and if money is not the issue for the extra rear speaker than go for it.I have done alot of different things in my home theater and the 7.1 set up works the best for me so far.Also be sure to place the two rear channel speakers about 2' or 3' apart from one another.