I can't give you an ownership experience with the N54. But I can with the N52. Great engine and reliable as a rock. The reason I'm commenting is you seem somewhat financially restricted. That tells me the N54 is going to provide a less satisfying ownership experience due to higher maintenance costs vs. the N52.
You can always bump the N52 to 255 hp or a bit more for the cost of a 3-stage intake manifold and free software upload to the ECU.
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