holy cow thats a shed load of stuff! you could loose yourself for months sorting all that stuff out! i think i'd keep all the amiga and games console stuff and wack the rest on ebay. to be honest, this all looks like a gathering of machines from schools and smaller educational establishments before they decided to go winPC. remember my middle school had an amiga 500, a couple of spectrums, a couple of commodore 128s, heard of secondary schools being pretty big on the ol Acorn Arcamedies.
maybe they should have rebadged the A1200/4000 the "Amiga *insert name of famous clever person here*" in order to appeal to schools. :-D
i'd keep the games consoles if only to say to my kids (if i have any) "this is what i had to use when i was your age" *waves zimmer frame about menecingly* "none of this multipixel pipeline fillrate garbage" :-)