Well, the general consensus of participants of this forum is to get the best and longest warranty you can afford.
It's not that these cars are unreliable, it's just that there are a lot of very expensive components that could go out, and if just one does, it will surely cost more than cost of the warranty.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".