Mine doesn't have the air suspension.

Given the city you're in, the winter temp will kill your CCV system. This is the only thing you need to seriously worry about. Search the forum and you'll find out TONS of complaints. Some people will opt out for a climate version, and some people just replace it every 2~3 years. If you don't, it'll freeze your oil separate valve, and pushing the engine oil either out from VCG or into cylinder, causing hydrolock and bending the rod.

Other than that, it's a pretty smooth ride. I still keep it as my utility truck, and haul things around town. Still prefer E53 to the newer E70, just IMHO.

Good Luck!

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01' 3.0i E53 (M54) with 164,000 miles
07' 3.0si E83 (N52) with 134,000 miles
08' 3.0si E70 (N52) with 91,000 miles