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I thought I had pressed 'reply' but didn't... So to answer your question, I have never noticed any road noise from neither the current H6 (3.0R spec b) or the old H4 (2.5i SE) I drove for 6 months.
There is a step up in running costs between the 2, and I wouldn't dismiss a 2.5 based on engine cc alone.
Mine (auto) was pulling nicely and was never found wanting (once the brakes had been sorted).I'm based in SE25. If you want to check it out let me know.
Who has the legacy? What's road noise like?
The idea of a petrol flat 6 is enticing. I didn't really like diesel, apart from the torque.
Seems 2.5 or 3, but jumped in tax in 2006 for the 3.
But the 5 was quiet and pleasant to do long journeys in., that's my main concern.