Crosman 600 Semi-Auto

Plan on taking an 85% Crosman 600 Semi-Auto in original rocket box (box shows wear) with manual and original ramrod to Texas Airgun Show in three weeks to sell. Anybody have a good idea what I should ask for it? I have a second one not in the box I plan on keeping. Just want a fair deal for seller and buyer. Then I can spend the money on something else. 
 
On Ebay and AA you can find them occasionally between $150 and $250. If working then around $200. If it needs sealing but has all the parts, between $150-180. If it has a few parts missing but nothing critical then around $130-160. With the original box and accessories, not less than $200 like Wadcutter said, and more like $250-300 if working as intended.

Rebuilding service (there are couple of folks who do this, maybe more) is between $55-75 plus shipping.