Well, if Music is your main concern; It seems like b) is the only choice that would compromise that requirement. If not getting out of yoru chair was more important than music, I would go with b). Otherwise - a)
I am doing option A myself & have been for over a year. I have no complaints. I only listen to digital sources anyway so it does not bother me at all. The Benchmark is a very capable pre-amp if you are only concerned with digital sources.