We have bunch of noobs asking this question recently quite a bit. If you would search the forum you would find the answer.
One last time.
If you buy springs to lower your car it's highly recommended to also get matching shocks ( shorter ones). You ask why? Well your stock shocks, after you install shorter springs, will compress under the weight of your car. Most likely you will be bottoming out every time you hit a pothole or bump and couple months later or sooner your stock shocks will blow out. That my friend force you to buy new, proper shocks and pay double for labor 1st time to install the springs 2nd time to replace your blown shocks (unless you will be doing it on your own you will be wasting your time). After all that being said set of new lowering springs and good matching shocks puts you in the neighborhood of the price you would pay for budget to mid range coilover kit (spring/shock combo with ability to adjust the ride hight). And that's the way to go due to adjustability option springs wouldn't give you. On some (higher end) coilovers you also can adjust dampening as well.
And everybody on here going to tell you if you lower your car once you will want to lower it more at some point...
Brands to google: raceland, rokkor, FK coilovers, RSK, Vogtland, KONI, Bilstein, H&R, KW.
Good luck.
