lowering question
Hope I don't sound like a caveman, but, what is a bumper spacer?
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Stock shocks are poor at controlling stock springs, so if you add more springrate then thats even less spring control. Your ride quality will change and in my opinion would be worse than before. If you don't care about that, then I guess you can rule it out. Ideally people should upgrade the shocks when changing springs.
Lowering the car can have other effects like what your alignment sits at. Your camber and toe will change. Alignment should be considered. Lowering the car changes the panhard bar's geometry as it connects between the chassis and axle so you may end up with a slightly offcenter rear end. Also the lower control arms will change their geometry angle. If you like to launch the car then this angle will hurt your traction a little. To fix that, people put in lower control arm relocation brackets so that the arms will be level or at an opposite angle. The opposite angle can have a poor effect on higher speed turning stability though.
Just some tidbits I thought I would toss out there for you
1) If you lower the car, I would probably change the shocks. The Decarbons are okay for the stock springs, but not for lowering springs. As Guz said, the ride will be really harsh. Firmer is good...harsh is not..Might as well do the shocks at the same time
2) If you lower the car, it will shift to the side a bit, (more if it's already off center form the factory - yes some are). An adjustable will fix this. If you ever plan on getting bigger wheels/tires, you'll NEED to re-center the rear so the tires don't rub...especially during hard cornering
3) As far as the springs go, go with what you like. They're all pretty good. I with with Eibach's Pro-kit (don't go with the Sporlines if you plan on lowering AND getting bigger wheels). After about 5 years, they have settled a bit, and did have to roll the fenders in a bit to fit my 295 tires, but it's all worked out in the end.
But I guess, some pics would help a bit...





You can see where my tire used to rub









