In the market for a CLK430 OR 350 OR 500
 

Hi everyone,
I am new to this site but belong to other forums as well and this Mercedes forum seems very active. A close friend of mine is in the market for a CLK convertible and hesitating between 3 models in the same price range.
2002-2003 CLK430 $7500 with 70k miles
2004 -2005 CLK500 $7500 to $8500 90k miles
2006-2007 CLK350 $7500 to $8500 with 100k+miles
2004-2006 CLK320 $7000-7500 with 70 k miles

I did my research online and still not sure how to help her. These cars have the service record and have been maintained properly, I was surprised to find out that a 2002-2003 CLK430 is worth as much as a 2005 CLK500 Is there a reason for that?
Between those three similar models which one would you go for knowing that they are all in similar condition.

Of course, a 2002 CLK55 would have been nice but it's above what she can afford.

Thank you