I'm a big fan of the Gallardo...I hate to pass judgment on the Murci without having driven it, but everyone I know who is serious about *driving* doesn't have positive feelings about the car. Same goes for LP640. A member here went with me to the local Lambo dealer, test drove the LP640, said thanks, and went and bought another GT instead the next week...
The Gallardo is a really fun car. It's not fast, but it's got a tremendous soundtrack and loads of grip.