I can only echo what Ash is saying here, especially the 20vT becoming more affordable to maintain. A few examples:
3 Years ago it was the norm for a Fiat Dealership to be charging between £1000-1200 to change the Coupe's belts (cambelt and Auxiliaries), I'm sure the price is still the same today, now a Coupe specialist can do this work for £300-600.
The red key issue, again scare stories of £1200 to change/reprogramme the ECU, door/boot locks, ignition barrel, and the supply of the new red key itself, today technology has progressed to a point where this problem can be overcome for £150.
Sorry I can't comment on the clutch price as I've never needed one but I'd say a guess of £350-400 all in would be about right, maybe even cheaper.
There are very few owners of 20vT's using Fiat for maintaining their cars as the prices are just too much, a good specialist is half the price and knows much more about them as they are working on them every day.
The Prof.
