Thank you all for your replies. Yesterday I listened Dynaudio contour 1,3se with nap300. This time, I took my nac272 with me I couldn't find much difference with C20 when compared their prices.
So as I decided to buy 1,3se, I start thinking about the speaker cables. With Monitor Audio RX2, I'm using supra rondo 4x4 biwire. I tried nacA5 and didn't like with RX2. Not sure which cable to use with 1,3se. Maybe, High fidelity ct1 or Ansuz ceramic speaker cable.
On my way home, I went to my friend's home to give his vinyl which he ordered. And saw his new speakers. Graham Audio LS5/9, with Sun Audio 300B amplifier. It was so musical and the level of clarity was very high. I don't know how it sounds with nap 300? But I'll try on Monday , and give my decision about contour 1,3se.