Hi Durr,
Just my 2 cents... whilst the 8000 (and depending how componants you plan to use) is probably to big for a small office, my thinking is if you have the physical space to place it in the room and since you are already have a mint condition working unit, why not try to use it?
Whilst also, you won't be able to use it at its full potential, you will find that these systems even at low volumes are a joy to listen to, as they have great depth and clarity. Often late at night I will listen to my 6000 at volumes less than 10 (0 - 60 scale) with some nice jazz or classical ......
So food for thought.... to go with some of the other good suggestions above for a new unit or back to the original idea of some 'smallish' speakers....
Good luck!
Laurence