Well the 400E would be the most reliable, the GM is FWD so their for is crap. Not to mention you would lose tons in depreciate like a rock.

Now if you do want a V12 and everyone should get one in their lives, the 750's are pretty cheap. But from what I understand they are not as powerful or as long lived as MB's 12. Personally I think an S600 is a better car all around. Their have been a few nice clean ones in the paper for low $20k's.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200