I don't know squat about caps in these kinds of applications or what they go for, but if you sell it on Craiglist start higher, you can always go down if it doesn't sell as it's free to list.
Also, expect haggling, so if you've got a price in mind jack it up a bit, then if they try to haggle you lower you'll get your asking price and they'll walk away happy because they saved a few bucks.