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^E36 and E39 are pretty much the same as your E53. Of course, you would save on gas since they are smaller and lighter.
The engine is the same, even with the smaller displacement M54B25. They share lots of components --> same ups and downs. Still need the suspension overhaul, cooling system overhaul. Same maintenance on Vanos seals, DISA valve....
If you have your E53 in good maintained condition, I'd say keep it.
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00 E39 DINAN S1 //M5 (82k miles)
06 E53 DINAN 4.8iS, born 2/18/2006 (126k miles) http://www.xoutpost.com/bmw-sav-foru...s-my-dslr.html
90 Straman Z32 TwinTurbo Convertible, (1 of 44 ever made) 5 speed, 444rwhp/451rwtq
01 360 Novitec Spider F1 (26k miles)
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