240z isolators will only lower the rear, so instead of your car looking like a 4x4, it will just look ridiculous.
Nate, what size are your tires? Bigger tires will help fill your wheel wells, and also give you a little more ground clearance. Honestly though, the 'before' ride height looks perfect to me. You just need a better spring/shock combo to get there. What was the 'before' ride height, and what is it now? It doesn't look low enough to scrape. My BMW is at about 4-4.5" inches off the ground, measured from the crossmember (I think), and I NEVER scrape anything, mind you I have stiff springs, and Bilstein sport shocks. To keep your wheels from rubbing the flares, you need to mount them higher. They look too low to me.
Ultimately, I would get coilovers and sectioned struts. It will be the most expensive route, but worth it IMO.