I may be able to answer your question . In my case , the complete opposite of what you are going through , happened. I fell in love with the Murci LP640 and never looked at the Gallardo(at the time the 560 was not launched). I had also never driven / sat -in either of the cars. After the LP640 came in , I enjoyed it thoroughly for the first few months. Loved every bit of the design , looks , power and sound . Soon after the initial charm had worn out , I started to look at the short-comings , or rather the flaws smacked me in the face. The LP640 was NEVER an easy car to drive . Seats were very uncomfortable and the driving position was off-center (this is coming from a relatively compact 5feet7inch person, not a 6feet plus giant). My car was running trouble free initially but over time certain CEL issues came up. The ground clearance is very low and suspension is very stiff.
In the midst of these issues , the LP560 was launched and a couple of my friends bought the 560. I had the pleasure of extended seat time in the car and also drove the 560 extensively and after driving the car , I immediately knew I had to get it! Agreed that the 560 solved many problems that were faced in the 520 . but the 520 in it self was an awesome car . The 560 / 520 are relatively ,much more comfortable and practical than the Murci/LP640. You can get nearly , if not the same , excitement from the Gallardo ,that you would from a Murci, at a lesser price and with much more drive-ability.
Although the Murci is a great looking car and sounds awesome , I would not say it is the best lamborghini to own. The Gallardo on the other hand , is. I would still recommend you get seat time / test drive both the cars to be sure of what you like , but I can say from personal experience of driving/owning both the improved murci(LP640) and the improved Gallardo(LP560) , that the Gallardo was always and will be always the better choice if you wish to drive the car a lot. If it is a matter of keeping it in the garage and taking it out once or twice in a week , then the Murci is a right choice.
Those flames are gonna garner more attention. Sounds wicked. 
