I agree Tenzo-R springs are okay... not a bad option for you, based on your application and budget. You are only lowering it for cosmetic purposes, but it depends on how comfertable you want your ride to be. Also a 1.5" drop isn't that much, especially with your 18's, you will still see a bunch of wheel gap.
H&R would be a better option because they are better quality, lower your car more, and about the same price where you are shopping (ebay)
http://cgi.ebay.com/ebaymotors/H-R-L...spagenameZWDVW