I agree that suspension modifications are great to tide you over while you're waiting for more power. I'd like to make a few suggestions though... eibach springs are top-notch in terms of quality and reliability, but I haven't heard much about their shocks. If you're looking for an adjustable shock setup there are probably a few that'll prove more capable and reliable than Eibach (koni, kyb and tokico come to mind). Also, although eibach sway bars are good quality, they wont do much to alter the cornering attitude of your car. At (I believe) 24mm front/19mm rear, you'll retain the same understeer-prone handling balance as stock, just with a reduced amount of body-roll (which in itself isn't really important). I'd suggest going with a combination of Honda OEM sway bars instead. In order to significantly reduce understeer, the ITR rear bar is probably your best option, and given the springs you're planning to use, probably a 21mm Si (5th gen) front.