I'd try the AZ SRII first to see if it's too bright. One downside of the Matrix Ref. IIs is they can slow things down a bit relatively speaking, which may or may not bother you but something to take into account besides tonal differences.
2 Acoustic Zen Silver Reference II IC's too much?
I had Acoustic Zen Silver Reference II XLR IC between my McIntosh 301 and McIntosh 6900 with great results (well, maybe I would prefer a slightly softer sound). Now 6900 is gone and it's upgraded to 402 power amp. Most likely it will be paired with C46. C46 has a rather "warm sounding" repuation so I'm thinking about getting another Silver Reference. Or maybe it will be way too bright and I need a Matrix Reference IC?