Lol. I am just telling you what it looks like.
You can price it however you want and toss it on ebay to go fishing. Just be upfront about everything so the likelihood of getting screwed over by the buyer is reduced.
Yes, you may be able to update it *now* and play online *now*...but who knows when MS releases the next update and stock flashes drive and the backups are worthless (unless the person who bought the system knows how to, and has the h/w to re-flash CFW)...or when MS performs the next ban-wave and outright bans the console for playing backups online.
If you are trying to get quick cash then you are probably best off on eBay, selling it to someone you dont know, and hoping it will be another month out at least before MS's next update (to give you time to sell it, and get feedback of course). And I would list all the games, like thegreatest said, so the buyer knows exactly what s/he is getting.
I dont condone piracy or modding systems with CFW, but IMHO it is your best bet.