It doesn't have to cost much. If I recall right, there were excellent stereo power amps at the buy and sell section before it was taken out. Names like Parasound, Carver and Hafler come to mind. Three stereo boxes would still be cheaper than that 5-ch Rotel power amp. But with more power reserves (three separate hefty power supplies.
Or, if you get the timing right, there are excellent jap surplus power amps at the pier, like some old Denon Pm series or Onkyo integra power amps. You could have 3 stereo power amps from the pier for less than 20T. And they can beat the hell out of any modern multichannel amps from Rotel.
Or even three separate stereo tube amps from AMX.
The only really expensive gear you need to get is a pre/pro. But even a good pre-owned HK, Marantz or NAd receiver with 5.1 line out would be just as great.
Then you can have both great audio and HT in one set-up.