Having a larger side wall will help lower your 60' time. !8" will be challenging. Its fairly "standard" to run the stock 16" x 8.5" TT wheels with the MT ET Street tires as other suggested. That is what I have used on my stock turbo car & I was able to get a 1.5x second 60'. Some people daily drive on this setup. Your interests in BF Goodrich g-Force T/A KDW are for long term street driving, toyo proxes r888 are a sticky road race tire still not a drag radial & Nitto NT555R are "slower" that the MT tires for a dedicated drag tire. If you really want to stick with an 18" wheel that is your best bet.
~Induetime~ "Lag Less" First Stock Turbo to break 500WHP on boost alone. New track car project "Diseaze": http://arizonazproject.wordpress DOT com Custom fabrication for the Z32: search QFAB on Facebook More custom fabrication: search FuturFabrication on Facebook