I don't have a Panda, but I may be buying one in the next few weeks... I'd definitely consider the 500, depends how much they'll be etc. They do look gorgeous though!
I wouldn't. Just got my new Panda and thrilled with it. Price wise I think the 500 will be pitched well above the price of the current Panda from what I have seen so far. Pound for pound can't beat the Panda.
500 looks lovely. But it is definitely a metrosexual car.
Also, I like the fact the Panda has 4 doors and my 6ft 5 brother can fit in the back. Doubt you do that with the 500 (unless it has a retracting roof ).