You can't go wrong with the price you gave. I have the same type and use it as my main Beomaster.
I would not use speakers that can't handle the 2*75 watt output. On lower volume it can work but not ideal and not good for the speakers at all.
It would be a got idea to test if its fully working correctly by using it on a daily basis. Overheating on the back cool ribs and the volumemotor can be tricky if not working.
Does it have the remote module installed on the front? Original remote?
In fully working condition its a wonderfull sounding Beomaster with power and stable.
The only thing I can compare with the 5000 is the lack of integrated cd connection. You only have TP2 on the 6000 master only! so a bit more manual switching for a cd player.