I'm pretty much in the same dilemma myself and also coming from a Msport 335 sedan.
The X5 and 535 is essentially the same price but you get so much more refinement in the 5 series compared to the X. Things just seem cheaper made and put together in the X5 for the same $$$. Another main concern for me is that the all new X5 should be coming out sometime in 2013. I saw a document somewhere that said that the current X5 will stop production sometime in 10/2012. Not sure how accurate that is though.
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