The W124 500E/E500 definitely has a more unique pedigree than then the W210 E55's AMG's, which IMHO, are more marketing, than one-offs.

I drove both a CLK55 and E55 (1999 and 2001), and while they have more power, and "razor-like" steering/suspension, the overall ride and construction doesn't feel bank-vault Mercedes, more like an Audi/BMW, which is OK if that's what you want.

If it's a "Sunday-only" type of car, get a W124 500E/E500.

:-) neil