how much difference does a player make

I am looking at adding a cd player to my hometheater rather than using the dvd player. I was thinking of a denon changer that would allow me to play multiple discs if I have company over. Some people feel NAD makes a decent player but is only single disc.

Would I notice a difference in players without having a high end 2 channel set up?

Are the two players mentioned any good or comparable to each other.

Would I actually hear a difference?