Sounds good if you don't get a better offer. Private sales are always harder to come by at the higher end of the used market. I heard a WBAC.com radio advert today - they (James Corden) pledge to honour price agreed online if actual condition reflects web declared condition. I wonder if they will hold themselves to that.
I think people always overestimate the value of their used cars... I think I have probably lost £5000 in a year and a half, which is about 25% - it's a lot of money, but probably not outrageous as most of the depreciation happens on leaving the showroom. I didn't take it in to WBAC, just got their valuation and decided that another £500 or so would be a reaonable uplift. I also used Honest John's pricing guide which showed what all the adverts are showing for my car over the last couple of months. His recommeded sale prices were way below that of the ads, which is interesting, seeming to suggest that deals should happen a fair whack (read £1k) below advertised prices...
As for my current car, it was bought with the head and not the heart (1.6 TDI

) so I can't say I love the car - it's a good car but not wonderful. The GTI will hopefully be a car that I can say I love with both head and heart!