SL55/63/65/R230 AMG: Main differences between '03-'05 SL55?

Primarily trying to figure out if the cost difference from year to year is really worth it on what would be equally equipped and mileage cars? Current budget restricts going any newer as I have to factor in a warranty and mods that I would want to do.
All other things being equal, would you buy an '03 with 25k miles or an '05 with 50k miles?
Fot the SL R230 Generation.
SL600, SL65's and SL55 have only 5 speed.
SL500 had a seven speed from 05 I think
SL550 has 7 speed Automatic
SL63 has 7 speed MCT
Small-Dick SL350 doesn't exist in USA, and that's a great Fact.




