well i originally was going with 19's for my car, but at the last minute switched to the Do-luck 18's. Now i have no clue what springs to go with. Any suggestions would be great. Pics of Z's with them on would be even better.

 

sorry for posting in the wrong spot....getting tire

 

here's a link to a pic post i put up a few days ago. JIC Coilovers and 18'shttps://my350z.com/forum/media-share/172652-snow-bunny.html

 

Go with a good coilover and you can adjust your ride hieght to make it look however you want!
I have 18's too (Volk's), but I have Tein Flex. I don't have a good side shot of the car, but mine is lowered by about an 1". Just remember that you will loose your stock camber adjustment limit when you lower the car more than 2/3". You will than need to upgrade your A-Arms and Camber/Traction bars to give you more range so that you don't get premature wear on your tires.