I have owned a W124 300E, W124 E420 and W210 E430. All are GREAT cars however...
I think the W210 E320 build quality is slightly better than the W202 C-Class but, not quite as good as the W124.
As far as the "feel" of the cars is concerned the W124 and W202 are somewhat similar in handling. The W210 feels bigger...closer to an S-Class than a W124.
If you lean toward luxury and room go for the 210. If you want a sportier feel go for the 124 or 202.
Bill Wood - Webmaster