i just got a 2000 ex and im look to get a catback system...im looking for something with a decently deep tone to it, and priced under $600

 

This should help you out

Personally i'd go Megan Drift Spec. Pretty cheap, sounds just fine.

 

greddy evo 2 best sounding ive ever heard

 

RSR ExMag ftw as far as sound goes haha price = [:'(]

 

Go on youtube and type in 2000 civic, and also the different exhausts. You can listen to how they sound on other peoples cars and it can give you an idea of what kind of tone you are looking at. Greddy evo does sound good, but it was a bit loud on my 96 integra gsr. I think when I put an exhuast on my 08 civic, im going to go for something a little more mellow...maybe like the Apexi WS2.

http://youtube.com/watch?v=vYAlI-mTK5I&feature=related

 

They don't get much deeper than Magnaflow. Take a look at my install procedure (link is in my sig) to see what that setup looks like.