I currently have a 2.0 system that comprises of a Harmon/Kardon AVR235 and two Energy C-7s for the front. I was looking for a good pair of rear surround speaks (not bookshelves) that would complement my other two speakers. Is it a general rule to go with the same brand name and the same series of speakers? If so, I was looking at the Energy C-R1 rear channel speakers from The Good Guys for $157.00 each. I was also looking at the Cambridge S200 surround speakers but I am not sure if they will work well with my C-7s. Anybody have any knowledge on these speakers or any recommendations?