When it comes to those sort of jobs there is no such thing as "overkill" as these machines have a very tough life.
As careful as you can be, you will always hit rocks and thick wood which does the head, shaft and engines a whole lot of no good. All I do is cut the grass with my 50cc Partner cutter and today I used up around a metre of 2.4mm line because of hidden rocks and bits of discarded barbed wire.
CD player = Marantz CD6006
DAC/pre = Rotel RC 1572
Power amp = ADA PF201
Speaks = Quadral Chromium Style 6