My personal view :
If u are looking for an affordable SACD player. I think SA15S1 offer that. In term of sound difference between the SA15 & 11, I don't hear much. The only disadvantage of the SA15 is that its only come with Analog RCA out. But anyway, its should not really matter unless u are running longer cable. And of course, SA11 offer more features. There is a filter selection for this model but u are talking about twice the price that u are paying for it as compared to the SA15.
I think its better that u audit the models side by side & do a comparison.
If u are not into SACD, there are really a lot of good redbrook players around. I am thinking of upgrading to a $7K used redbrook player.
I just get back to this hobby recently. I had my first system 15 years ago & given up due to room constrain.
So, do I consider myself a beginner ?