Adcom - To modify or not?

Guys,

I have to bring an Adcom 5800 in for service. I originally thought to repair back to original spec, but have read about some shops that modify with better caps, resistors, etc. So I call on the collective wisdom of the forum...

For money spent, would I be better off modifying the Adcom 5800 or just putting that same money towards something like a Bryston 4b-SST (used) or Parasound A21?

If better off modifying, is there a recommendation on what to get upgraded and to what parts?

Thanks!