@steerpike
Is this an o3o or o4o Tower?
If it's an o3o I would say don't sell it for less than $500, I sold my dead A3kT for $275 Canadian (with keyboard mouse, manuals, 12meg fast ram, 2 chip, everything I had for the A3kT), if this is boxed with all manuals and some bonus cards, this is a true collectors machine.
Too bad I stopped/cut my collection down otherwise I would jump all over this, especially the fact that you are in Toronto!