Portugal11, best you try both.
But just so you know, the Matrix RefII is hybrid silver/copper. No sacrifice in high frequnecies there. However, in the wrong system with the rest of the electronics being on the warm side, the bass of the Matrix RefII may be just a tad slow. In this case, you may benefit from SIlver RefII. But if your system is neutral, I think the Matrix II would fit very well.
You have an integrated. I have separates. I once tried 2 Silver RefII interconnects and the sound was not natural. It was dry, bright and there was no way I could live with it. I also had 2 Matrix RefII at one point. It was very good, but the Silver II from cdp to pre cleared things up a bit. I still think that the Matrix II would be a better fit for you. Plus, it is cheaper.
If I were you, I'd buy both cables used and then keep the best one and sell the other.
Good luck!
P.S.
Another cable that can give you the best of both worlds is the Nirvana S-L. This one was the closest to Silver RefII in my system and had plenty of warmth with quick bass.