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Coming from a 5-series, you really won't be happy going backward to a 3-series unless your end experience with the 5er was - "meh - it's too comfortable, too big" - I want less.
I know the experience well of trying to figure out the next car and bouncing around - but if you were considering/willing to go to 3-series, why would you want an X5? not judging, but curious - that's going to be way more of a tank SUV significantly lower performance. it's very much a family hauler, sure it can be fun compared to mini vans and other SUVs, but it's not a sedan/coupe sports car by any stretch.
based on what you are contemplating - the M550 even used would be your best bet, it's insane. The perfect combo of luxury, size and an enormous boost to speed with the V8 over your 540. granted, I'm biased; having the M550 but I had the 340 and SQ5 - nothing compares to the 5-series if you rank performance and fun toward the top of your list.
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