I have a foot in both the Ferrari camp and Porsche camp
I live near Maranello and work for Ferrari but spent my hard earned cash on a Porsche 930. Not because I thought Ferrari's were not as good as Porsches but because a 930 was the car I always wanted and suited my needs more than a F355.
Some of the negative comments about Ferrari's on here are very broad sweeping statements and different negative comments could easily be applied to short comings in classic Porsches.
You pay your money and take your choice, for me I 'm glad not everyone wants to drive around in a classic Porsche as when I'm out and about I know there is only a very slim chance I will see anothe classic Porsche
PS I would go for a 550 any day over a 456