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we have air susp with 21"s, it's been extremely comfortable all around. of course with the exception to the bad roads there are some road noise.
we've taken it on countless long road trips and at times we've exceeded the speed limit without even knowing (~100mph).
as for the discussion of power/performance, we have the 40i and honestly, when its on sport, acceleration is more than enough to push to this fully packed vehicle to 100+ within seconds, cant imagine how much faster a 50i/M50 would be.
With that said, i would go with the 20"s, your probably not giving up much up in terms of ride comfort and getting what you really want.
EDIT: miss read you post about the standard susp. I cant speak to that since all I've driven was air susp.
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