should be ok if you look after it, probably one of the easier ones?
with dark colours (blues, blacks) unless your a complete physco with cleaning it you will get swirls etc from washing, which wont show nearly as much on a white.
One thing white is very vogue at the moment, its on lots of Mini's, some BMW's etc. which it might not be in a couple of years, but it is a classic colour on the 500.
Manufacturer's charge more for some colours to extract more £££ from you.