I would get the rims first. Its always harder saving for more expensive things. Plus rims would make a bigger diff than lowering the car. you dont wanna lower the car and ride on stock rims thats kind of ghetto and 15s on a civic wontmake your car look like a 4wheeler. So my vot is with the rims. If your looking for a place to get them
www.machiii.net has tehm for 500 free shipping.