I ordered mine with 19's for a few reasons.
1. They look like M5 wheels. 20" look like they have been stolen from the M6
2. I am sick of road noise 19's are reported to be quieter
3. As you say the Uk roads are rubbish so more rubber the better
4. 20" are over 2k more. If (when) i want to spend 2k more on wheels I will pick my own. + 1" = 2k more Really
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540i
GTR-R35, F90 M5, X3MC, RS3, RS7, M5, S7, S3, RS3, RS6, GTR R35, 996 Turbo, M5, RS6 V10, Cayenne Turbo S