Get a Minimig Board.. Basically an Amiga 500/2000 the size of a CD-Case that runs Amiga floppy images from an SD card. It hooks to a VGA monitor. Load it up with a bunch of Amiga 500 games and go to town. Plenty of stuff to play with.
http://www.acube-systems.biz/common/minimig_advert.jpg
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