Is there a clear disadvantage to buying the 3.2 L over the 4.3 L or the 5.0 L?

[kayooh]

Hello List,
I am seeking the collective wisdom of the group on the possible purchase of a used ML.

Are there any pitfalls one should be aware of? Is there a clear disadvantage to buying the 3.2 L over the 4.3 L or the 5.0 L?? Of course the smaller capacity engine would have less power, but would the reduction be bad enough to make me wish I had gone with bigger engine.
I became aware through this list of some potential problems with the harmonic balancer, limited number of replacement keys and some others I don't recall at the moment, so is there other issues to consider or worry about?

I do love MB products, yet the ML is a tad too small for me, so I am also considering the 4.6 L Range Rover which is the perfect size for me. Maybe someone on the list is in a position to compare the two.

I should also mention that I am only considering '98 model years or newer.

Thank you all.