your stock struts will probably be fine the springs mentioned wont drop the car enough to start blowin struts, but a different spring rate can always potentially cause problems so for that reason you may be btter with say, tokico blues at least. Ive had megan springs on tokico blues for a couple years now and even tho they are probly the stiffest spring option, i wouldnt want then to be any softer for handling reasons. (which is greatly better than 4x4 stock mode and will feel about twice as stiff as oe, but not dash thundering stiff, like coils would be - FYI) as for the lowering aspect, megans drop the front the lowest of your options, and the eibachs drop the rear the most, i beilive, whereas the megans wont drop the rear much.. megans are also the cheapest going for like 160, and for me they hold up great