so you want snow tires to improve traction in the snow, however you are goign to lower the car while you have the snow tires on it?? I have the 195/60/15's that derek is talking about and the only thing that held me back last winter was the bottom of the car hitting the snow. other than that i coulda gone through anything.
If you want my opinion, buy the 195/60's and use those this winter, then when summer rolls around lower your car and switch out rims/tires.