Don't bother with 16's. Not much cost saving.
Should get a set of 33 GTR rims, lip the guards and get 235 or maybe even 245. They're forged and quite light, probably lighter than most. I think I weighed them at about 11kg's?
I had to pump my guards a bit to make 245's fit.
Should get some for about a grand. sometimes less.
With semi's are you willing to spend $2k or just like $900- $1k for KU's / RS-R's? I can recommend starting with 2nd hand semi's.