02 C70 vert Need upgrades advice

[mercurysys]

I am looking at doing the big brake upgrade (320mm front & 302mm rear), so I am thinking about getting 18" wheels. I also need to replace my shocks & struts, they are wore out, so I have to plan this out properly. I want to improve handling but want to still keep comfort (something along the lines of like our Veracruz has, firm but comfortable, for when my wife rides in the car). I am also thinking about going with 25mm front and 22mm rear anti-sway bars in the future, so that needs to be figured in also.

If I go 18" wheels, will there be an issue with clearance if I do springs at the same time?
If I can do 18s, what shocks/struts & springs do you recommend? Will I need a certain offset on the wheels to make them work?
If 18s will not work due to clearance, I would assume that 17s would be needed. What offset should I use in that case to make sure that the brakes and suspension work with them?

Thank you.