HA2007,
First, regardless of which one you wish to settle, have the money on hand so that you can settle immediately.
Second, contact the CA and request a PFD. If they will agree to that over the phone, great, but fax one of the PFD letters from here on the boards that includes the language that they will DELETE the entry on your credit reports within 2 business days of them receiving the funds and have them sign it and return it before you sign it and send it back.
Third, do NOT pay over the phone - send certified check CMRRR. If you pay over the phone they have your account information and we all know CA's are the devil's creation.

Hope I helped. If anyone else would like to chime in, please do.
11/14/07 TU 567 - EQ 561 - EX 577
11/29/07 TU ??? - EQ 573 - EX ???
12/10/07 TU ??? - EQ 579 - EX ??? - 60% util - OOPS!