I say go as wide and thick as possible. I mean, why risk bending your rims right? Unless you plan to drop it the thicker the tire the more it will fill the wheel well anyway. Im running 215/45/17
eibachs arent that great i had them on my p5, they are ment more for daily driving with a little sportyness, if you want it to REALLY handle it would be best to get a constant spring rate.
i had tokico blues, eibach pro kit, progress 23mm rear, mazda3 17" with 215/40/17 BFG G-Sports