NMAC BTWN A C152 ON A LONG STRAIGHT IN APCH AND A C210 XING FLT PATHS IN CRUISE OUTSIDE OF CLASS D AIRSPACE.

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AFTER AN UNEVENTFUL 1 HR PLEASURE FLT I WAS APCHING NORTH PERRY'S AIRSPACE FROM THE W. I CALLED THE TWR CTLR WHILE APPROX 10 MI W OF THE ARPT ON THE 270 DEG RADIAL. I WAS ISSUED A STRAIGHT-IN APCH TO RWY 9R; WITH INSTRUCTIONS TO CALL WHEN ON A 2 MI FINAL. I WAS AT 1300 FT MSL (WHICH IS ALSO AGL AT THIS LOCATION); DSNDING GRADUALLY TO 1200 FT. VISIBILITY WAS GOOD. FEW CLOUDS WERE NEAR. AT AROUND 6 MI OUT; THE TWR CTLR ADVISED ME OF TFC AT MY 2 O'CLOCK POS; AT MY ALT ABOUT 1 MI AWAY. AGAINST THE BACKGROUND OF THE CITY; I SCANNED FOR THE PLANE; WHICH APPARENTLY WAS NOT IN CONTACT WITH NORTH PERRY CTLRS; BEING OUTSIDE OF THEIR AIRSPACE. IT TOOK ABOUT 2 SECONDS TO SPOT THE PLANE; ANOTHER 2 SECONDS TO REALIZE IT WAS ON A COLLISION COURSE WITH ME; AND THEN I BANKED AND TURNED TO THE L AT THE SAME TIME THE OTHER PLANE BANKED AND TURNED TO HIS L; THUS AVOIDING A COLLISION AND PASSING BY EACH OTHER AT AN EXTREMELY CLOSE DISTANCE -- ABOUT HALF OF A FOOTBALL FIELD. IT WAS A C210; BUT IT HAPPENED TOO QUICKLY TO GET THE REGISTRATION NUMBER. I THANKED THE TWR CTLR FOR CALLING OUT THE TFC. OPA LOCKA ARPT; WHICH IS JUST S OF NORTH PERRY ARPT; HAS ACFT TAKING OFF AND TURNING NW JUST OUTSIDE OF NORTH PERRY'S AIRSPACE; SO THEY ARE NOT ON THE SAME FREQ AS ACFT APCHING NORTH PERRY FROM THE W. THE MIAMI-FT LAUDERDALE AREA IS HIGHLY DEVELOPED IN URBAN SPRAWL; WHICH MAKES ACFT TEND TO BLEND IN WITH THE LANDSCAPE; ESPECIALLY AT LOW ALT DURING APCHS AND DEPS. IF THE NORTH PERRY CTLR HADN'T SEEN THIS OTHER ACFT ON HIS RADAR SCREEN; I MIGHT NOT HAVE SEEN IT IN TIME. ALSO; I MADE THE JUDGEMENT TO MAKE MY EVASIVE TURN TO THE L AFTER ASSESSING THE SIT FOR A SPLIT SECOND AND REALIZING THAT DUE TO THE CONVERGENCE ANGLE; A R TURN WOULD HAVE PUT ME INTO THE PATH OF THE OTHER PLANE DUE TO THE CLOSENESS. THE OTHER PLT MUST HAVE SENSED THE SAME THING AT THE SAME TIME; BECAUSE WE BOTH MADE L TURNS AT THE SAME INSTANT. IT ALL HAPPENED SO QUICKLY. IT WAS OVER IN A COUPLE OF SECONDS.