Interesting.
Currently I am running my Realistic STA-47 into a pair of Klipsch CF-2's and a pair of "white van speakers (WVS)" that have a ported 10", two mids (4"?), and a tweeter (upgraded from Parts Express). I'm using the A channel for one set and the B channel for the other set. With only the CF-2s, the sound is warm. With the WVS, there are more highs an lows, but the mids are missing. With all 4 speakers running A+B, I'm in heaven. I have them all set up in a firing line facing forward, CF-2's on the outside, not in corners. The CF-2's are on spikes on carpet. Room size is 11x12, with a huge oak desk in the middle, and bookshelves all around (lots of hard surfaces and angles). 9' ceiling smooth surface.
The new receiver I'm planning on putting in a larger room 12x14. Laminate hardwood floor. Speakers are two Polk Audio Monitor 5B's, and two Model PR-950S by Linear Dynamics by KLH (I know, junk but they were under $60 for the pair). I plan on having the KLH's forward facing, and the Polk's either on top of them, or on stands in the rear side firing / angled / who knows. I may do extensive modifications to the KLH's (I live very close to Parts Express), or I may retire them and just buy something better on CL if it costs too much to upgrade.
I listen to rock and metal music. This new system will need to handle A/V duties as well. Which brings up a new question. I can go into Walmart and buy a Sony STR-DH590 for $250. But will it sound as great as these old systems?