I am debating between 18" and 19" for my car. I want that snug look.

Any ideas of what tire size should I get for 18's or the 19's?

225/45/19???? I know I would feel bumps on the road.

I am also considering getting some springs Vogtland or Eibach. Let me know thanks.

 

Use this to figure out the proper sizing - it'll give you percentage comparisons between your stock size and whatever else you decide to try. That way you can keep the calibration of your speedo and odo the same.

http://www.miata.net/garage/tirecalc.html