i have seen several 060 boards for 2000's go for around 200 on ebay. that with system going for 80 to 120 makes for a 300 to 350 system maybe 400 with cd burner
noone is sugesting the system is only worth 100 but if you want any bids start it reasonably and yes set a reserve price. thats what the reserve option is for.
i have spent around 800 on amiga stuff over the years and have tried never to rip anyone off so before you start throwing names around consider that. i have also sold stuff on ebay and have had some success at it. you have to consider not only what you need or want but what the market (collectors, users, scavangers) will support. 500 is not unreasonable for that system, but it is tough to get as a starting bid.