I use NCSreporting. You get your own account rep, and it is possible to negotiate higher payouts than what they start you at.
The best thing about NCS is they compile all the card programs into a single check. If you want to try and sign up and manage each individual card separately more power to you. Unless you do extreme signup volumes they probably won't ever increase your payout. NCS's advantage lies here exactly. Since all the card companies pay them as a whole their volume is huge and their own compensation very high for each and every signup, whether it be from a 1 timer or top ranking site providing 1000's of signups a month. Basically, I believe you'll find you can get higher $$ if you are a small to medium referrer through NCS and without the hassel of managing each program / account / paycheck separately. Good luck!