I was also torn when buying my springs to go the MazdaSpeed route, but then I saw them in person and decided against it. The ride is much improved, but if visuals are what you are going for, look elsewhere, as it was very difficult to notice the drop.
I went ahead and got the road magnet springs. They give the car a lowered stance (1.1 inch drop), but still allow it to be comfortable as a daily driver. I have yet to scrape the front bumper or bottom out, and I was sure I'd have issues and the ride, which while stiffer, is still comfortable.
Good luck with whatever you decide.