Spike, your advert may be a little too detailed, with the huge bills possibly scaring people off. It may also deter people by the fact that you've had it for just over a year. I would suggest stating that it's clean as a whistle, any inspection no problem and don't say how long you've owned it until you're asked, which is usually when someone's come to look at it. Also, if you're willing to take a penny less, put it down to your bottom whack and then say no offers. There are a few in the trade at circa 6/7k, nowhere near as nice as yours, but that's what you'd be looking at if you were to trade it in. From my experience of selling all my previous Maseratis throught the private route. Ebay is worth a go too as I've always had lots of repsonse from there.
Hope that's of some use to you.