After that try GEOS 128 with a 1581 or one of those CMD hard drives, and the extra 512K of RAM. It really wasn't a bad system, for the era. Oh, how I drooled over the C128 in the magazines. Right up until I got my Amiga, of course. 
Actually, I did get a chance to see GEOS.
I was a big advocate of GUIs early on.
And I'd have to give Microsoft some credit for that, as my prior experiences with MacOS were frustrating.
The owner and lead engineer at Delmar Company asked me at one point if we should support a GUI, and after my very ethusiastic response he had the first ports of Steve Adams G-Windows GUI running within two weeks.
This was as definately one way we diferentiated ourselves from Peripheral Technologies and StarKits. We never supported FLEX or SKDOS, only multi-user/multi-tasking OS9 68K AND we had the option of a GUI that worked quite well.
Anyway, heck, this is a Commodore thread, so...
So, I should state that while I was always entranced by the platform, I had issues with it as well.
The primary objection to the Amiga at the time (in comparison to what we were working with)?
First, multi-tasking on an Amiga appears to be cooperative rather than priority based.
Second, stability seemed to be an issue.
That is a polite way of saying they were crash prone.
There was some pretty crappy code floating around, and some packages just didn't play well with others.
Third, Amigas are designed to be single user systems. Sure you might be able to work around that, but at a further cost in stability.
Our base system, at $995, was a four user system supporting terminal (yeah, no GUI, but then one of our markets was POS systems).
Anyway, again, I'm throughly off topic.
My apologies.
Maybe I should consider attending this event.
Its being sponsored by people who want us to have a future, and can celebrate the past.
I don't want to appear to be too negative.
After all, the first 6809 based system I got to play with was a CBM design.
At first, their focus WAS business machines (after all, its part of the name).