New 18x9 wheels to order. What tires to get?

I've got 18x9 and 18x10 chrome Saleen style wheels from American Muscle. They are wrapped in 275/35/18 and 285/35/18 Nitto NT555's. The Nittos have so much more grip than the Hankook Ventus that came off of the old 17's. Prior to the Hankook I had Potenza RE750's... they were nice

You're going to need an alignment after installing new tires and wheels.... why not go ahead and lower the car now? I went with an Eibach Pro-Kit and used Energy Suspension urethane spring buffers.

I love the way the car handles with its lower center of gravity but it is still tame enough to be comfortable going over speed bumps and road hazards.

If I had to go back and do it again I think I would have left the spring buffers out of the car to get it just a wee bit lower for a more aggressive look. Still, the 18's fill the tire well nicely and I don't have scrubbing issues.

My shocks and struts are Tokico Blue HP's.

I highly recommend you go ahead and lower the car now. You'll enjoy it so much more with the new wheels.