The E430 - Xenon headlights can be pricey to fix and eventually you will have to fix them. Also, not sure about cold air intake and muffler delete. I'd rather have an MB that's stock.

The W220 S-Class - It's a W220 S-Class.............'nuff said.

The E320 - By far the simplest and easiest to repair/maintain of the three choices. I own an 00' and an 01', both RWD. They suck in the snow, but other than that, they're reliable, relatively fuel efficient, and drive like a dream.