if it helps at all i got my hasselblad 500cm kit for 1500CAD, it came with 2 backs, 50, 80 150 lenses a WLF and 90 degree prism, hoods for all lenses. everything was in perfect condition, but it kinda smells. i think 1300US is a little high, but again, it depends on the quality. if it's "near new", then it's worth it for sure, but if you've used it for 15 years i would recommend you drop the price a little bit.
that being said the market has a way of regulating itself on ebay. if the item is in high demand the price is usually regulated pretty well and the kit will usually be the same price all around (give or take about 50$ for your kit). when i was checking out used hasselblad 500cm's on ebay about 4 months ago they all seemed to go for about $1000 used. i guess you'll see if anyone bids or not. there's lots of ebay strategies that can work for and against you. with a price like that many people may just ignore your item for something with a "no reserve, starting at $0.01", but end up buying it for $1250 just because it attracted their attention initially. you may want to consider that option plus many more strategies. selling on ebay is an acquired technique that requires risk, skill and knowledge of ebay. do some research on it and follow the trends before you put it up for sale there. you might do better on a local newspaper or website as there are still many people who avoid ebay and would consider $1300 a steal.
hope this helps...jordan.