ok, i hate to be an ass with this comment...and i usually dont dissuade anyone from mods....but....marchesini rims for an fz6??? unsprung weight for more performance? at the end of the day, its still gonna be a fz6...with rims worth more than the bike itself.
its like seeing a 'hoopdee' with expensive rims worth more than the car. seriously, if you want unsprung weight and more performance, than there are numerous affordable used sportbikes out there...gixxers, cbrs, ninjas, etc.
i love my fz6, but i thoroughly understand what it is and what its capable of...and putting marchesini rims on it wont change that. put that money in a bank account and use it for a worth while purpose someday.