it's good to read that the 17" shouldnt ruine my days...
i also recognized that the 160s look bigger due to these spikes. that's why i like them, too.
i am wondering about the 'slight differences' that you mentioned. i couldn't find any between the greek version and the german one (was there some weeks ago). maybe except of one thing: in greece, they use to sell the cars more often with continental tires, while in germany it's easier to get a new e90 with michelin or bridgestone tires.
last month there was a test at auto-motor-sport regaring RFT and they found our that the michelin tires where much more comfortable than the rest...
regarding your thoughts about installing a sportier suspension:
respect. i couldnt do it... (maybe i am too old... LOL)