I agree with the C64 being the top personal computer of the time.. well the C64C was the best edition. The Amiga should be bumped up to 3rd or even 2nd being the killer machine of that decade and some of the 90's. Not sure why Atari wasn't mentioned, especially the Atari 520/1024ST which seemed to be as common as Amiga 500's (Well in New Zealand anyway) I hated the Atari ad's of the day with colours being thrown around bah. TRS stuff... thought that was more 70's didnt see any of those around in the mid 80's from what I can remember, especially not in the local computer geek crowd. If you didnt have a C64 or an Amiga 500 it was a hard push finding hardware/software.
Also surprised that the Spectrum wasn't in there, I'm also a fan of the Amstrad CPC464, CPC664, CPC6128 range.. especially the CPC6128... I remember playing Sabateur a lot, Farmers use to sell them (Farmers is a local retail outlet here in New Zealand):-)
PC's... which should really be called IBM clones.. as PC means personal computer which all the above are but thats a different topic. back in the 80's didnt mean much, especially when you had to pay so much more for less features and slower machines. I didn't bother with them until I made the mistake of purchasing a 486sx25 (with a sound blaster pro woohoo).
Anyway now we're stuck with x86 machines, fingers crossed for the AmigaOne X1000 :-)