Cable VS. DSL Proxy results

Ok so I am currently running cable and am a semi-noob when it comes to ISPs, Proxies, and router/NAT firewall. I'm currently running cable internet and am wondering if while using a software proxy (Tor+Vidalia+Privoxy) how well am I anon. Does my IP become re-assigned before it hits my ISP or after.

Is there anyway to say change my IP before it even hits my ISP going outbound??

I figured I'd get nothing but "YOUR A PEDO LOL PARTY V&" comments being most of the people that post around here are fucking immature virgins who think they're funny when they're really not.

Thanks to the first guy for not being a huge douchebag.

And no, I'm not a pedophile, and i'm not going to give you proof, because I don't give a shit if you believe me or not.