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This funny
Sometimes components may appear to be the same as something off the shelf, but they aren't always. When vendors(Krell for example) buy in bulk, they can have products tailored to their needs. 
Amp for Tannoy TD12?
Either would do fine. 
Capacitor log Mundorf Silver in Oil
In the next week or two I should be comparing Mundorf S/O, Claritycap MR's, and Duelund copper VSF's, I can't wait. 
Tannoy rewire ?
Jeff also made some excellent recommendations when I upgraded my Tannoy's last year. 
What is the best power cable under $200.00 retail?
Another vote for Signal Cable. 
Can someone describe the sound of KEF IQ30's ?
They are voiced similar to the Polks you currently have. Polk's LSi series is much warmer than the RTi/RTiA. 
DIY solid core speaker cable: connectors?
Goertz makes nice solid silver spades that you could solder your cables to. http://www.madisound.com/images/goertz/tn/Goertz-Speaker-Connectors.jpg 
I want to upgrade from Polk rti28's
Nice link Gb. You can always use a little more resistance in the HF circuit to tone things down. 
I want to upgrade from Polk rti28's
I would consider Polk's LSi's, they're made for music unlike the RTi series. 
4ohm and 8ohm
Is the Marantz rated for 4ohm operation? If so, you'll be fine. You may have to adjust the gain levels though. Sometimes reversing the + and - leads helps also. But to get the best surround sound, the speakers really should be timbre matched. 
Richard Gray's Power Company
Can you elaborate on what "transformer parading" is? 
McIntosh MC-60 Amplifiers
Audioclassics in upstate NY or DeWick repairs in TN, use whoever is closer to your location. 
cambridge azur 640c v2 or marantz dv7001
Two different sounds, the Marantz being warm and the Cambridge being slightly forward. For redbook, the Cambridge will probably be a better player though. 
Floorstanders designed to be against the wall?
Polk SDA's sound best a few inches from rear wall. 
Floorstanding Speakers - 12'x14' Room
Check out the Gemme Tanto, they would work great in that room.