Yeah, 19's would fit
http://club3g.com/forum/showthread.php?t=87142 but I'd be riding on sidewalls that would be way to thin.
The reason I mentioned just getting 18's was because of the ride quality concerns but I'm afraid Todd is right about that not making much of a difference on it's own. And everything I've ever read about any lowered vehicle is that the ride becomes harsher and with the frost heaves and pot holes we've got around here I'm a little worried about it being too rough for my taste. And I know it's a
sporty car, but it looks like it should ride a little more on the luxury side, which is what I want to keep. I wanted to lower the Avenger, but in time I got used to the gap and it didn't bother me anymore. Maybe the same will hold true until then, but for now I just have to keep researching and saving up.
BTW: In my searching for possible 18's I found a handy tire size calculator
http://www.miata.net/garage/tirecalc.htmlMaybe sticky material?