I had the 3.6's for a long time.
they are great speakers... HOWEVER, you need to feed them lots and lots of power to get them to sound good. Or should I say, the more power you feed them, the better they will sound.
I have used/heard the 3.6's with many amplifiers. Including the W-5 and Theta amps. For HT either would be OK. HOWEVER, if you into 2 channel, there are MUCH better amps for driving the maggies than the W-5 and Theta amps.
Amplifiers that can make the Maggies sing:
2 Plinius SA-100 mk3 amps in MONO
1 Plinius SA-250 mk4 amp
2 Plinius SA-250 mk4 amps in MONO
PASS 350X amp or higher in the PASS series
LAMM monoblock amps (solid state)
Do you see a trend?
Basically you need amplification that has amazing current and power to get the most out of the maggies. Most 100-200wpc amps just do not drive the maggies nearly as well as a more powerful 500+ wpc hi current amp.
I once compared the W-5 to 2 Plinius SA100 mk3's in MONO driving the Maggies. There was no comparison. The W-5 just could not get the kinds of dynamics out of the Maggies that the Plinius amps could.
My suggestion would be to get an amp/amps to drive the maggies, and get other amps to drive the other channel. Frankly the rear and side channel amplification are not that important as HT goes. I have experiemented with using high quality amps for rears, and it made LITTLE difference if any at all. The cinter is a different story. The center is a channel that a lot of sound comes out of in HT.
Frankly, I sold my maggies in an effort to get a more dynamic speaker. I have the Vienna Acoustic Mahlers which I use for my 2 channel and L/R in my HT setup. The Mahlers are a much better HT speaker than the Maggies. I think the Mahlers do everything as well or better than the Maggies in two channel except the midrange (and they are just a hair behind the maggies in the midrange.
My 2c.
Keith