Sorry to hear about the electronic hiccups. My 4.8 had a couple early on (the infamous high battery drain message) but has been fine since.

My lease is up in a few months, and I would like to go with the 35d, which I test drove this weekend, but the lack of the M-sport package for the diesel in the USA is a bummer.

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2012 F10 550xi Carbon black/oyster
2011 E92 M3 SSII/black
2012 W166 ML63 Steel grey/porcelain
2007 E93 monaco blue/beige (retired)
2010 E70 35d Space grey/saddle brown (retired)