I second Super Breakout if the A800 version had selectable sounds like the A2600. If not, I also found a video for one that looks more like Arkanoid called Break It which also has tones:
Also... hard drive for the Atari 800?? That had to be incredibly expensive. Just now looked it up and apparently they were only made by 3rd parties like Supra (who I remember from my Amiga days, but that was some years later).