I have an 01' with most OEM options. I have been updating it and adding features (nav, V8 only comfort seats, etc) to make it A) more modern and B) add more OEM-esq features. I am still working on adding more OEM offerings, i.e.: heated rear seats and so forth. My sister just bought a CPO E70 X5 about two weeks ago. I have been driving it a LOT since she bought it. Though it is a perfectly nice car and I do like it, I would never get rid of my E53 for it!!! The E70 has some additional features, not available on the E53 and such but feels somehow 'numb' to me. My E53 has so much personality and the E70 just feels 'blah' and cookie cutter to me. I don't hate it, I like it but I LOVE the E53!!!

There's my two cents when it comes to the E53 and the thought of replacing one.

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-Dusty
2007 X3, Montego Blue
1998 Z3 Roadster, Montreal Blue
1996 Z3 Roadster, Jet Black
2016 Miata LE, Soul Red
1981 DeLorean, Stainless Steel
1979 Ferrari 308 GTS, Ocean Blue