Follow a few on eBay and see what they sell for.....you could offer it on here for about 5% less as that would take into account the fees you pay on a site like eBay. However....buyers there have various guarantees and credit facilities so that might go against what you can ask 'elsewhere'.
Just to give you an idea, I recently (October last year)sold a mint condition 5DII, with 8,500 acctuations for £825 on Gumtree. I had to wait a few weeks before I got that serious offer, as most people were just p!$$ takers stating they could buy a new one from HK for not much more. I had advertised it for £900, and thought it was worth every penny. However, it does seem to be a buyers market at the moment.
The problem with the 5d Mkii is that even with a low shutter count, that doesn't mean to say the camera hasn't been hammered on the video front.
As a buyer, I'd be taking a gamble. Therefore I'd be happy at £750, might go to £800. But I doubt I'd go much higher than that.
But then I am based in Yorkshire.
only shot x2, 3 minute videos (not my thing)
And being from Scotland i'd rather keep a hold of it than sell it for £800.00
probably going to sell up altogether so will get a better price from someone looking to buy into the brand, great kit with some L glass,580 ex and more (studio gear also a possiblity of going)
when i get a list together i'll post here before ebay
Might consider a swap for a decent fishing boat ! not particularly interested in the cash, so willing to wait for the right offer, anyone giving up a life on the water ?