I've won a mini!

Hi I recently won a mini cooper sport automatic registered Dec 2010. It only has 1720 miles on the clock. It has every extra you could think of........ heated leather seats sun roof upgraded stereo, sat nav, blue tooth etc etc etc.... I am a very lucky lady! Unfortunately this vehicle as lovely as it is, is totally impractical for me, so sadly I am going to have to sell it. I have no idea of it's value, it is in immaculate condition and as far as I know only had one previous careful well known lady owner. I have contacted some dealers but they are more interested in part exchange and I am still waiting for a reply from them. Can anyone on this site offer me some advice or give me clue to it's true value?
Thanks Mandy O':)