F800GS - price?

[Endurodude]

I need some advice from more seasoned rider than I! My F8 is a 2010 plate and will, after my trip this summer, have accrued pretty much 50k miles. It's a 30th anniversary edition (for what that's worth, although the red seat is nice!), has Ohlins front and rear, a Corbin seat, Wunderlich Vario screen, pivot pegs, Rox risers, metal mule pannier racks (although I'm keeping the boxes!), rear rack and BMW top box, Adventure spec crash bars, BMW bash plate, pivot pegs and Touratech handgaurds. I assume buyers will pretty much focus on the mileage, but I'm hoping the other features add a little value, if only the Ohlins! It's got a full service history at the dealership.

So, the question: if I were to sell the bike, what sort of price would I get a) from an official BMW dealer and b) on eBay? Privately would obviously be more, but I like the less-hassle-nature of the dealership sale. I could obviously go and ask at the dealership, but I'd like an idea of whether they're offering a fair price of not.

Any suggestions on the above would be welcome!