How about this Marantz PM-15SI for $895?As a Marantz PM15S2 owner, the above is an outstanding deal. There are very few vintage receivers/amps that could compete with this unit - built at Marantz' reference factory in Japan, 80 wpc continuous into 8 ohms/120 wpc continuous into 4 ohms, nealy 40 lbs. This is not the disposable amplifier that you fear. It is more of an heirloom amp that will be with you a long time.
Whichever way you go, make sure the amp you buy is 4 ohm continuously rated across the entire frequency spectrum. You never know what speakers you may end up with and a 4 ohm rated amp will be ready to drive many out there. 4 Ohm ratings across the entire frequency range is something that most vintage amps were not. Most speakers back in the day were a more easier 8 ohm load to drive. Good luck!