Just one thought about the eibach springs...

I would hesitate to lower the car without matching struts. What ends-up happening is that the OE shocks have x inches of travel (let's say 8 for argument). If you lower the car 2" with springs using the OE shocks, you lose a 2" of travel. This will hurt the ride substantially and will cause the car to be jumpy in turns. Moreover I think you increase the roll-over risk because the shocks will always be partially compressed. Thus any time you put the shocks into rebound they may tend to rebound more abruptly thereby causing tipping. Add grippier tires to the mix and I think it is a bad recipe.

If you are going to do springs then do shocks too. The only maunfacturer I found who does both is AC Schnitzer, but their setup is hella expensive.