Lease is up in a year, what next?

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2001 Mazda MP3
So, I have a lease that is ending in a year. I have one child, and we are hoping for another on, in the not so distant future. I have always been anti CUV, and no desire for a MiniVan, but I want something large enough for a dog crate.

So that leaves me with, an E Class wagon(3-4 years old, not new). Anyone had experience with Mercedes's?
 
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