You can use a medium powered amp like the Marantz as long as you don't want to reach very loud volumes and/or you don't sit a great distance from your speakers.
This calculator will show you the power you need to reach a given max volume at a given distance.
For instance, at 3 meters away, with 80 watts, you could go as high as 96 dB. Which is fairly loud.
The bottom line is this, you won't be able to push the 1027's to their limits with an 80 watt amp, but it should still be satisfyingly loud enough. If you push the volume up and hear the onset of distortion, turn it down and you will be fine.