If your only running 2 5200's there is nothing to gain with processor.
In fact this is not entirely true. Have you really tried both of the options?
I used to have the Squeezebox hooked up directly to my DSP's.
When I received my G61r and hooked it up I gained a significant quality boost to the music.
I was amazed because I was not aware that this could happen. Little sceptical, I asked my spouse and friend who were in another area of the room, not aware of what I was doing.
They confirmed and thought there was a positive change in the music.
So you should loan a processor and try for yourself.
