Sounds a bit on the low side. How many miles? What kind of condition is it in? If it is well taken care of I'd condsider it. The 500e is what I would have if I could afford it but I can't - not yet at least. So I "settled" for a 400e. Not qite the same car but nearly half the price. This is a rare car. I live in West Hollywood and we see lots of EVERTHING and I see more Ferrari Marenellos than I see 500e's.
You might want to check this link for more specific details
http://members.lycos.nl/Mercedes500E/
It's a terrific car.
Tom