I think 550 is a bit BMW's take on what Alpina B5 would have done without go in M5 territory (or just MB E53), which is awesome, but just a different kind of car than 340.
For 340 I'm not sure if you can spec it as nicely as 5 series, if you could I can see myself picking 340 over 540 (i.e. 340 is E39 5 series big, which is big enough, and smaller car is general more toss able)
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