What model did you get? Top of the range Titanium 1.6TDCi can be had for £11,550 so hope the dealer got close to that. If you havent already signed anything I can get you £500 off whatever the dealers last price is.
The Fiesta is certainly comfortable on the motorway, but a bit noisy for me for the speed I drive, but definitely quieter than any other B car as well as smoother, it does drive like a larger car. Glad you didnt go for the ECOnetic, it has the same 1.6 diesel but you lose out some places.
What colour did you get?
Don't see anything wrong with buying new, if anyone remembers, I did and never regretted it (i got a hefty discount though). I see motoring as a pure expenditure, no asset, nothing to own, no matter how I pay for it, so if I buy new I dont care really about depreciation.
Right now its quite a unique car, well above any of its competitors, and well... you cant buy these used just yet!