Here's my $.02. I love the 400E ('92-'93) and E420 ('94-'95), and would recommend any year. I've read that the early ones may have problems with the engine wiring harness.
1. The 300E / 400E / E420 have the same interior.
2. The 1992 400E was the first year of R134a a/c regrigerant.
2. The 400E always had a 4.2 liter V8. This engine was also used for one year only in the next E class (W210) in 1997 (E420). An E420 was not offered in 1996. In 1998, the M113 4.3 liter was introduced.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".