thats top info Den. This should go to HOW-TO section once its taken its course.
17" wheels dont have rubbing problems on the arches when the car is dropped 40mm either which is good. I chose to run 205/45/17s when i had 17s as it was a slightly less harsh ride over the nasty roads around me.Also i found 215s on the front did make steering a little too heavy for my liking.But thats just preference.
Silvia Engineering reccomended 16x6.5 for best overall handling which i think is about right. Lastly with 17s i always use a strutt brace as it made a hell of a diference on my s12 when ive had 17s.