Well, the working A3000 will fetch a nice price
The A3000 case (and broken motherboard) might also be useful to someone.. (How much you want for that.. sent to cornwall, through royal mail?)
Blizzard 1230 would usually reach at least £50 on ebay (usually more though)
The A1200s will fetch something too...
The boxed A500 might make something, but A500s were quite common so I dunno if the box would up the value or not...
The rest of it is almost give-away stuff.. so if you sell the A3000 that works, throw it in with it
Edit: and the ST is throw-away stuff lol (just joking I know a lot of ppl liked their STs)