Well, I don't know what you normally sell on e-bay, but I think selling bikes could be a big step.
You will have to pack the bike yourself, which means some disassembly will be required, protecting the bike with proper packing materials and buying a proper box from your bike shop to put it in. If not, you will have to pay your LBS to do it for you. You might be comfortable with all of that, but it's worth considering everything before doing this. Craigslist could be the easier route to go down, because you wouldn't have to ship.
But I agree with Kactus, do some work before selling. Also really good pics and a good description could make quite a difference, but being an e-bayer, you already know that.
Price wise, I'm thinking $700 - $900 is possible in ready-to-ride condition... Good luck whatever you do!
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It never gets easier, you just go faster. ~ Greg LeMond