I'm not trying to be rude but this is the most commonly asked question. SEARCH is a great option.
Suspension upgrades are the best thing you could do for the $$$$. Just think you could spend $1500 on a good exhaust, header, & intake while only gaining very little power(the noise makes it seem faster). Take that same money and you could have a very decent suspension setup.
If it were my car I would use H&R springs($150 from
www.tirerack.com ) with some adjustable struts Koni sports or KYB AGX. Next attention would be given the rear sway bar, either adding or enlarging the stock junk. With an upgraded rear sway and stiff suspension you run the chance of tearing or bending the flimsy econo car frame. In this case beaks can supply you with a reinforcement kit. Rear lower tie bars are also a wise idea with large rear sways. For the front I prefer a stock sway with poly bushings and shorter endlinks with poly bushings.
If the car doesn't already have good tires, that would be next considering they play the biggest role in handling along with acceleration and braking.
After all that I would worry about upper strut bars since they provide more looks than function with good springs/struts & a large rear sway. Strut bars are like icing to a cake. Don't bother with those $40 bar kits from ebay, they are junk. Look into solid mount bars, ones without hinged ends - Neuspeed.
You can't forget about an alignment, camber kits are optional at 1.5" drops anything more will require camber kits. It's not only the camber that changes, toe is also affected and that's the bigger tire eater.
Springs:
H&R
Eibach
Neuspeed
Struts:
Koni
KYB
Tokico
Sways:
Neuspeed
Suspension Tech.
Eibach
Strut bar & Tie bars:
Neuspeed
Camber kits:
Ingalls
DO NOT BE CHEAP WITH YOUR SUSPENSION or you will regret it. Price does reflect quality.
http://www.suspension.com/stam-bar.htm
www.tirerack.com
www.modacar.com
www.jegs.com
http://www.suspension.com/civic.htm
http://www.suspension.com/tips.htm