How much is my iPhone worth on eBay?

I have an unlocked iPhone 5s.
64g
Space Grey
Model: A1457
With charger, box, all box content including SIM card remover and manuals etc.

It is used, but in 100% mint condition. Not a single scratch/mark/scuff/greasy fingerprint on either the phone or the box.

How much should I sell it for on eBay? Of course I'd rather sell as 'buy it now' at a set price, but will auction if need be.
How much for 'buy it now', and how much should I set the starting bid price? And roughly how much will they buyers bid to? I can start a very well written ad for the item, with professional wording including serial numbers etc.

Start the bidding at a $1, then you will get the greatest number of bidders watching your item. You phone will sell for whatever the market for that phone indeed is.

Look up the same type/model on ebay and see what they sold for and with what accessories. Iphones sell like hotcakes on ebay.

It would sell quickly as long as the icloud ID is wiped off it and its unlocked.

Start the bidding at a dollar and set the buy it now for 600