I had a Simaudio 600I with Revel F52s and loved it.
I then upgraded speakers to Magico S1s and found I wanted a bit more power and decided to go with separates. Since the Magico's are very neutral and the Simaudio sound is very detailed and a little forward (but certainly not bright) I went with a Pass Labs X250.8 amplifier to get a bit of warmth. After trying the amplifier with a Pass preamp (X10) and Hegel (P20) I tried a SimAudio 740P and it and the X250.8 sounded amazing together! Definitely a BIG step up on my 600I and the other two separate combinations I had tried.
I've never heard the W8 or 860A so can't compare them with the Pass amplifier, but keep that combo in mind.
If your speakers slant towards warmth or a darker sound the all Simaudio combo might be best; but if not, the Pass (music has a little warmth, great timber, and soundstage) along with the the 740P (by far the most neutral preamp I've had in my system along with throwing an amazing soundstage and adding a feel of depth/3-Dimensionality to the music) is killer.
Good Luck!
I then upgraded speakers to Magico S1s and found I wanted a bit more power and decided to go with separates. Since the Magico's are very neutral and the Simaudio sound is very detailed and a little forward (but certainly not bright) I went with a Pass Labs X250.8 amplifier to get a bit of warmth. After trying the amplifier with a Pass preamp (X10) and Hegel (P20) I tried a SimAudio 740P and it and the X250.8 sounded amazing together! Definitely a BIG step up on my 600I and the other two separate combinations I had tried.
I've never heard the W8 or 860A so can't compare them with the Pass amplifier, but keep that combo in mind.
If your speakers slant towards warmth or a darker sound the all Simaudio combo might be best; but if not, the Pass (music has a little warmth, great timber, and soundstage) along with the the 740P (by far the most neutral preamp I've had in my system along with throwing an amazing soundstage and adding a feel of depth/3-Dimensionality to the music) is killer.
Good Luck!