I may be wrong but I think that there is no Amiga version of Chaos. Chaos is totally worth playing if only for the sfx.
Amiga has 'Lords of Chaos' and 'Total Chaos' but not Chaos.
The ST version is maybe not as balanced as the Spectrum one but it has brawsome sounds from great sitcoms and filums!
It was an 'unofficial' version so maybe you can't count the ST one either. There must be an 'unofficial' Amiga version of Chaos somwehere?
I agree so much about HatariX being needed for GP2x and also PSP because it is impossible to hear the Chaos sfx when playing on both! You can't hear the sfx properly even by altering the settings and the controls make playing it really messy business!