Your right on both counts...207 rr's seem to go down well with most people and changing the 190 for a 180 will promote quicker turn in etc.
I can't comment first hand (as a 748 owner which come with 180 as standard) but changing the rear for a 180 has been mentioned on numerous occasions in magazines etc and does seem worthwhile...it all comes down to personal handling tastes...I'm sure someone will be along in a mo to say they did it and didn't like it