I just sold a a bunch of equipment on eBay last week. Did real well. Some lenses sold for more that I paid for them 5 years ago.
But some words of advice. From my experience, I saw more international bidders for my camera gear than I have for other items I have sold in the past. Evidently, they can buy the gear, pay international shipping and customs fees cheaper than buying it local. Also, I saw many bids from international bidders with 0 or 1 feedback. Everyone has to start somewhere but I would prefer not on my good glass. I have never had a problem and always sold worldwide, but you have to be comfortable with the risk or place restrictions on your auction to US only and be prepared to cancel bids that do not comply.
KEH is a good place to get online estimates of what they would pay. It is easy and they have a good rep.
Chuck