Thanks so far. Those names help a lot.
The main questions remaining unresolved, are Which? (di or bi), and Where? (sides or rears)... and of course, Who?.
A good eff rating is gonna be a good thing using the power plant of the Onkyo TX SR 805... 130wpc. .. and its a near lengthy run of wire too.
I did suspect the surr sides would be best for the di/bi units. I do have 5 Silverline and two Canton bookshelfs right now.
I had even thought to use a pair of Silverline Minuet directionals somewhere to go with the Sonata IIIs, SR 15, and Centerstage.
The last issue is price. Whichever side surrs, dis or bis, are gonna have to be moderately priced or at least within reason.
BTW, the Silverline monitors do sound pretty full bodied, despite their higher eff rating.
Anything else I should know and other speaker models, are greatly appreciated.