I would second all the positive comments - I bought mine from Nuvola and found Nareman to be friendly, helpful and honest. Mostly he really seemed to care about the marque, the cars themselves, and the whole buying experience for his customers. I didnt know a great deal about the history of Maserati, nor the exact differences between a 4200, a facelift 4200 and a GS and he went through it all with me at great length. He's also very picky about what cars he'll take on - so, as far as I could tell, everything he sells is top quality and well looked after.
Certainly mine has turned out to be as good a car as it looked. Can't ask for more than that!