B737 FLC INITIATE TCASII CLB DUE TO UNCTLED ACFT AT CLASS B BASE ALT WHILE ON VECTOR TO SAN RWY 27; AND SCT CTLR ISSUES CONFUSING VECTORS WHICH CONFLICT WITH A B727.

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AT 5000 FT MSL; 170 KTS; N DOWNWIND FOR RWY 27 AT SAN; APCH CTL CALLED OUR ATTN TO TFC AT OUR 11-11:30 O'CLOCK POS ABOUT 5 MI. WE SAW A TCASII SIGNATURE FOR THAT ACFT; BUT COULD NOT SEE IT VISUALLY. ATC THEN DIRECTED US TO TURN R TO 130 DEGS TO AVOID SAID TFC. AS WE BEGAN THE TURN; WE RECEIVED A TCASII RA TO CLB. WE FOLLOWED THE RA; TURNING OFF AUTOPLT AND AUTOTHROTTLES. AT THIS POINT; I VISUALLY ACQUIRED THE RA PRODUCING ACFT; AND CONTINUED TO CLB (RA) AND TURN TO THE R TO AVOID SAME. THE FO (PNF) ADVISED ATC OF OUR RA MANEUVER. AT LEAST 2 ACR ACFT WERE ON FINAL APCH TO SAN RWY 27. ATC ADVISED 'CLR TO MANEUVER AS NECESSARY TO AVOID TFC.' CLBING R TURN TO AVOID TFC RESULTED IN A HEADING MORE SOUTHERLY THAN 130 DEGS. 'CLR OF CONFLICT' ADVISORY FROM TCASII OCCURRED AT 5800 FT MSL. DSNDED BACK TO 5000 FT; ATC SAID TURN R TO 360 DEGS; TURN L TO 110 DEGS. TFC AT 12 O'CLOCK POS; TURN R IMMEDIATELY TO 360 DEGS. WE COMPLIED; WERE RE-SEQUENCED INTO THE APCH TO RWY 27; CLRED TO INTERCEPT THE LOC AND SUBSEQUENTLY CLRED FOR A VISUAL APCH. I FEEL CONTRIBUTING FACTORS TO BE: 1) AN ACFT IN CLASS B AIRSPACE WITHOUT CLRNC; 2) AVOIDANCE VECTORS ISSUED TOO LATE BY ATC; 3) ATC VECTORS INTO THE TFC PATTERN 'BOX;' 4) UNDESIRED HEADING RESULTING FROM RA AND VISUAL MANEUVERING TO AVOID TFC; AND 5) CTLR ISSUING INSTRUCTIONS SO RAPID FIRE AS TO LEAD TO CONFUSION AND MAKE IT DIFFICULT TO RESPOND. THE SECOND TFC CALL WAS AN ACR ON FINAL TO RWY 27; SAN. THAT ACFT TURNED S; WE TURNED N; CLOSEST LOSS OF SEPARATION APPEARED TO BE 4 MI.