2000 Civic EX Upgrades

I am looking to do some minor tuning on my 2000 civic ex. What would be some good cat-back systems that I could pick up that are not really loud or Expensive. I have already bought and installed my Injen cold air intake....witch gave me just a few extra points under the hood. Also looking into cams, coil-overs, and light body kits...Just a lip kit..if anyone has some input I would be thankful. Thanks

Nyguy34