Gazelle is a complete rip off! I have a perfect barely used 64GB original (no wifi) and was quoted in the $200 range.
Just for kicks I looked thorough and got a quote for my Apple 27" Cinema Display original box and all and got a lovely $167.00 offer. Insane!
@OP, it seems you're right in the pocket with a fair price and including your extras. The problem I have with Craigslist, is the idiots that offer you $75 and some chewed bubblegum hoping you will take the offer and flip it for a profit and the obvious scam attempts with Paypal.
If all fails, go the eBay route. I have bought and sold a lot of Apple hardware with both parties happy.